Change description

For this PR, I added the new abilities from Pokemon Champions created for the new Mega Evolutions from Legends Z-A. The new abilities are taken from https://serebii.net/pokemonchampions/newabilities.shtml

I added abilities to Pokemon from what is currently available by Serebii: https://serebii.net/pokemonchampions/megaabilities.shtml. Everything posted as of right now is included in this PR. I don't have the game, so I'm assuming that the list is not complete because only 180 Pokemon are available in the game (according to one of Serebii's posts on Bluesky).

I also added a version and version group for Pokemon Champions, as needed by the new ability entries.

As an open question, there is something that I believe is new here. We haven't yet added battle simulators (like Pokemon Stadium and, now, Pokemon Champions), but this is the first time a battle simulator like Pokemon Champions has added new content (i.e. new abilities). I added a new version and version group for it so that the new abilities could be related accordingly, but would we rather avoid adding Champions and instead mark the abilities as being added in a different version group? I figure this approach is fine, but I wanted to see what others thought.

Contributor check list

• I have written a description of the contribution and explained its motivation.
• I have written tests for my code changes (if applicable).
• I have read and understood the AI Assisted Contribution guidelines.
• I will own this change in production, and I am prepared to fix any bugs caused by my code change.