There was one similar, I think. Wasn't there a challenge at one time where you had to use the same type as the gym leader? For E4, you just use Pokemon you've used in gym fights, if memory serves. And next Sydian-made challenge will be in June. Well, that's events anyway. Never know when I decide to make a non-event challenge haha.
And Vappy, I feel so bad for you, I really do. :( I am gonna try to think of something I can do for you. Can't guarantee it'll be much, but I just feel like I should do something, cause all my Swablus are special. :( And I don't like it when one of them is sick.