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So, I've been playing this japanese Red Version my gf got me, and something weird just happened.
I was battling one of the trainers next to Erika. My charmeleon levelled up to 33 during the fight, and learned Slash. Trainer sends out her Ivysaur, I use Slash on it, it has about 1/4 of its health left. Here's the weird part: something happens, and Ivysaur's health goes back up to full. I use Slash two more times and it dies.
The only thing I can think of is that the Trainer used a Potion or something, but I don't think the AI can use a Potion if their Pokemon has full health at the start of a turn... and Ivysaur definitely doesn't learn any healing moves like that. What happened, /vp/?