The registration desk at the Celadon Gym was staffed by a young woman whose expression shifted from professional to excited the moment she saw who approached.
"Sasuke Uchiha. We've been expecting you."
"Has word spread that quickly?"
"Gym Leader Tsunade personally requested notification when you registered." The attendant's fingers moved across her terminal. "She's approved your challenge for one week from today. The seventh slot on the schedule."
"One week?"
"Is that acceptable?"
Sasuke considered the timeline. One week to prepare for the most challenging battle of his journey so far. One week to develop strategies against a trainer who had decades more experience and a team specifically designed to counter challengers.
"That's acceptable."
"Excellent." The attendant completed the registration, then leaned forward slightly. "Between us, Tsunade mentioned she's looking forward to this. She doesn't say that often."
"I'll try to make it worth her anticipation."
The training began immediately.
Celadon Battle Park occupied several acres of public land near the gym district, practice fields designed for trainers preparing for exactly this kind of challenge. The facilities were excellent, but Sasuke found himself questioning his initial strategic assumptions before he'd even begun.
"The obvious choice is Victini," he said, working through scenarios with his companions. "Fire-type advantage over Grass. Raw power that could overwhelm most opponents."
"But predictable," Miyuki observed. "Grandmother will have faced countless Fire-type challengers. Her defenses against that approach will be comprehensive."
"Exactly. Tsunade's Venusaur has survived battles against Champion-level Fire specialists. She knows how to handle type disadvantage."
"So what's the unexpected approach?" Kasumi asked.
Sasuke released a Pokéball, and Blastoise materialized with familiar steadiness, the Shellfish Pokémon he'd received as a gift years ago, now fully evolved and carrying power that few opponents could match.
"Water versus Grass."
"That's... counterintuitive," Kiyomi said carefully.
"Why not? Naruto fought Zabuza's water-type Kingler with his fire-type Charizard and won. If he can do it, so can I."
Sasuke smiled with a competitive spark in his eyes.
"That would be unexpected. Type-advantage aside, she would also have to adapt. Her prepared strategies become less relevant." Miyuki nodded slowly. "Grandmother is brilliant at anticipation. Taking away her predictions could be decisive."
"But Water is resisted by Grass," Kasumi pointed out. "How do you overcome that?"
Sasuke's response was a TM case that he opened to reveal a recently purchased disc.
"Ice Beam."
The transformation took three days.
Blastoise had always been a Water specialist, Hydro Pump, Water Gun, Surf, techniques that emphasized its natural typing. Adding Ice Beam to the repertoire required retraining instincts that had developed over years.
"The move works through your water cannons," Sasuke explained during practice sessions. "Same mechanics, different energy type. You're not learning something new, you're applying something familiar in a new way."
Blastoise rumbled understanding. The early attempts were imprecise, Ice Beam lacking the focus that Water moves achieved naturally. But gradual improvement showed in each session.
By day three, Blastoise could switch between Water and Ice attacks with minimal transition time.
"Mixed typing approach," Sasuke announced. "Grass resists Water but is weak to Ice. If we can land Ice Beam strikes while maintaining Water pressure..."
"Tsunade can't defend both simultaneously," Miyuki finished. "Her Grass-types will be constantly choosing between resistances."
"That's the theory."
"And the practice?"
Sasuke gestured toward the training field. "That's what this week is for."
The practice matches drew crowds.
Sasuke hadn't intended for his training to become public spectacle, but Celadon Battle Park's open layout made privacy impossible. Other trainers paused their own sessions to watch. Casual visitors gathered along the field boundaries. Even gym staff appeared during breaks, observing the Supernova's preparation.
The sparring sessions emphasized adaptation over raw power.
Kiyomi had arranged for practice opponents, trainers with Grass-type partners willing to test themselves against Sasuke's developing approach. Each match provided data. Each exchange revealed weaknesses to address.
"Your transitions are still too slow," Kiyomi observed after a session against a particularly aggressive Tangela. "The gap between Water Gun and Ice Beam gives your opponent recovery time."
"Two seconds between moves."
"Should be one. Less if possible."
Blastoise practiced the switch until muscle memory developed. Water to Ice. Ice to Water. The cannon mechanisms adapting to different energy signatures with increasing fluidity.
Miyuki's contributions proved essential.
"Grandmother's Venusaur has been with her for over fifty years," she explained during a strategy session. "I've watched them battle since I was a child. I know their patterns."
"What patterns?"
"Venusaur relies on Chlorophyll, its ability doubles Speed in sunlight. Grandmother always opens with Sunny Day to activate this advantage." Miyuki traced diagrams in the air. "But Sunny Day creates vulnerabilities too."
"Such as?"
"Overheating. Prolonged sun exposure combined with intense battle exertion can cause Grass-types to overheat, their natural cooling systems can't compensate. Venusaur in particular has heavy armor that traps heat."
"Create conditions where Sunny Day becomes liability rather than advantage."
"Exactly. Force extended combat. Make Venusaur work constantly without rest periods. Its own ability becomes a timer counting down to exhaustion."
"That requires surviving long enough to exploit it."
"Yes. Which is why your aggressive strategy matters." Miyuki's golden eyes met his. "Don't let Grandmother set up her preferred battle conditions. Force her to react rather than dictate."
Kasumi's contribution was agricultural.
"Vitaberries before the battle," she said, presenting a carefully prepared selection. "My special cultivation. These particular specimens boost special attack without compromising defense."
"Battle enhancement berries?"
"Natural stat modification. Perfectly legal under League rules, and particularly effective for Pokémon whose primary damage comes from special attacks." Kasumi indicated Blastoise's cannons. "Hydro Pump and Ice Beam are both special. The berries will increase their impact by approximately fifteen percent."
"Fifteen percent could be decisive."
"That's why I spent months developing them."
Blastoise accepted the sample berry with obvious appreciation, the subtle boost already apparent in the enhanced gleam of its Water-type aura.
Kiyomi's analysis provided the strategic framework.
"I've studied every recorded Tsunade battle from the past five years," she reported. "Over three hundred matches. The patterns are clear."
"What patterns?"
"Defensive attrition. Tsunade favors strategies that wear opponents down rather than overwhelming them directly. Toxic to poison. Leech Seed to drain health. Synthesis to recover damage while her opponents weaken."
"Stall tactics."
"Extremely effective stall tactics. Most challengers lose because they can't maintain offensive pressure long enough to overcome Tsunade's regeneration." Kiyomi pulled up statistical analysis. "Average battle duration against Tsunade: eighteen minutes. Average against other gym leaders: eight minutes."
"She extends matches to exploit her defensive advantages."
"Precisely. Which means your strategy must do the opposite. Overwhelming aggression. Constant pressure. Don't give her time to establish defenses or begin draining your Pokémon."
"All-out offense."
"Risky. Leaves Blastoise vulnerable to counter-attacks if the aggression fails. But calculated risk based on Tsunade's known patterns." Kiyomi's expression was serious. "You either win quickly or you probably don't win at all."
The final piece came on day five.
Blastoise had been developing a new technique, something beyond standard Water-type moves, something that pushed the Pokémon's capabilities to their absolute limit.
"Hydro Cannon," Sasuke said, watching his partner prepare the attack against a reinforced training target.
The power that erupted from Blastoise's cannons was unlike anything they'd achieved before. Water compressed beyond natural limits, launched with force that shattered the target and cratered the ground behind it.
"Ultimate Water-type move," Kiyomi breathed. "I've read about this. The most powerful Water attack possible, but it exhausts the user completely."
"One-shot strategy," Sasuke confirmed. "If Hydro Cannon connects at full power, the battle might end immediately. If it misses or is blocked, Blastoise will be vulnerable."
"High risk, high reward."
"Exactly what we need against Tsunade. She won't expect a Water-type to threaten instant victory."
Blastoise practiced the technique throughout day five and six, learning not just to execute it, but to mask the preparation so opponents couldn't predict when the devastating attack would come.
The night before the battle, Sasuke sat in meditation with Blastoise beside him.
Victory required bond, the kind of connection between trainer and Pokémon that transcended verbal command. They had to feel each other, anticipate each other, become extensions of a single will.
The Mobile Home's living area had been cleared for this purpose. Kasumi, Miyuki, and Kiyomi had retreated to their rooms, understanding that this preparation required solitude.
"Tomorrow we face Tsunade," Sasuke said quietly. "The strongest gym leader I've challenged. The most experienced opponent we've encountered."
Blastoise rumbled acknowledgment.
"Our strategy is aggressive. Our approach is risky. If we make mistakes, we lose."
Another rumble, confident rather than concerned.
"But you're not worried."
Blastoise's eyes met Sasuke's. In that gaze was everything that made their partnership work, years of training, shared victories, mutual trust that had developed through countless battles and quiet moments alike.
"Neither am I."
They remained in meditation as night deepened around them, synchronizing their thoughts, aligning their intentions.
Sasuke could feel Blastoise's presence as clearly as his own heartbeat. Could sense the Pokémon's power waiting to be unleashed. Could anticipate its movements before they occurred.
"We're ready," he said.
Blastoise's response was a quiet rumble of absolute agreement.