gotta say, this is, by far the best custom mega evolution I've seen! it looks great, especially the fact that it isn't too drastic a change from its original form like most other peoples' custom evolutions. the grass/fire type makes perfect sense as its most detrimental weakness (fire) is eliminated and its ability needs sunshine to activate. all I can suggest is that its ability can possibly be something like Solar Power+ (Solar Power Plus) or something like that where it raises all the stats of ally pokemon rather than just the two. this will make Mega Cherrim the ultimate support pokemon! (that smogon will inevitably ban lol ) gotta say man, this thing looks awesome! grass types are my favorite type of all. Mega SceptileXMega Cherrim ftw!
wouldn't be surprised if Gamefreak added your design to the new games. Bravo!
Hey, I attempted a profile write up if you're interested:
Upon Mega Evolving, Cherrim has discovered a means to create its own light with fire, and can at last enjoy being cheerful and energetic even in the darkest of nights or cloudiest of days. Although being in bright sunlight increases its vitality even more, it runs the risk of wearing itself out too quickly.
this is the perfect pokemon for a grass and fire type so this is needed and right now...
Also, I feel like Solar Ray should have power of 100 or slightly higher, but the catch is that it ONLY works during the Sunny weather condition. It should have a 20% chance to lower opponent's accuracy as well as a 25% chance to burn the opponent. However, for the sun to even become active, I feel it's ability should be changed to a renamed version of the Drought ability (because Drought doesn't really fit as an ability for such an amazing flower).