I see, that's great, i'll just have to train a pair of clamperls I missed that event with Celebi because i got to catch it the first time i had a battle with it, would have been interesting to see haha
About the delevel it's okay, it was just a thought i had at the moment. It would be cool to see it on a hack though, even if it's just a low priority work "just to see what it would be like"
But in fact, if you let your imagination go wild, you can even pìcture a whole new concept for a pokemon hack with that in mind:
*Or just make it so if it faints it will still be there at full health or recovering, so you have to come back later. This would work best on a pokemon game with in-game clock, but step count could work just as well or having to visit a pokecenter between fights.
(Spoiler since it is WAY, WAY offtopic, i can't believe my own imagination)