Sorry meme above does not have anything to do with Mega tropius but it does make do much sense so I wanted to post it.
Thanks to @starflight-GG-heh for suggesting this mega! Mega tropius gains the ability flower gift, due to the fact that it gives out fruit to other pokemon and people. Flower gift gives a 50% boost to its sp attack and attack, and the partners get the same boost- but only in the sunlight, so teaming it up with Groudon might be a good idea. Mega tropius gets a boost to all of its stats. Its appearance changes to where there are pink flowers all over its body, thicker armor, and larger wings. A veil of petals also seem to surround it.
Stat boosts:
25 sp attack
10 speed
15 attack
30 sp defense
20 defense