The most exciting part could be the strategy involved. Maybe Ash figures out a way to counter Pikachu's electric attacks. He might use his Oshawott's water - type moves to create a wet field, which would make Pikachu's electric attacks less effective. Then, while Pikachu is trying to figure out what to do, Ash's other Pokemon like Hawlucha could swoop in for a surprise attack. This back - and - forth of strategies between Ash and Pikachu (assuming Pikachu can think on its own in the fanfic) would be super exciting.
The most exciting part could be when Pikachu uses its most powerful move, like Volt Tackle, against one of Ash's really strong Pokemon like Greninja. The clash of their attacks, with Pikachu all charged up and Greninja ready with its Water Shuriken or some other powerful move, would be intense. The build - up to this moment, with both Pokemon sizing each other up and the anticipation of which move will land first, would be really thrilling.
I think the most exciting part would be if there's a moment of surprise. For example, if Ash sends out a seemingly weak Pokemon like Caterpie against Pikachu. But then Caterpie evolves during the battle into Butterfree and uses some unexpected move that catches Pikachu off guard. This kind of unexpected turn of events can really make the fanfic exciting and keep the readers on the edge of their seats.
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