I'd suggest a few things. I do know that this is a level 50 team, and it would be difficult to make a few changes, so these are only suggestions.
-Icy Wind is a bit redundant on Glalie, since he already has ICe beam. Explosion would be a good alternative for when he's low on health. Hidden power can cover a few of his weaknesses.
-With Lanturn, I'd go with surf for dependability over brute force. Thunderbolt is a good TM for him to make him a bit stronger, and thunder wave can cripple the enemy.
-I'd advise against teaching Chimecho Double Edge, it has terrible attack. Since it looks like you have it for support, why not give it reflect and/or light screen for defense?
-Silver wind can be a bit more powerful than leech life for Ninjask. If you're lucky, you could even get a strong hidden power bug.
-If you want, you could give him earthquake so he can have a STAB move. I assume this is in-game, so hyper beam shouldn't be too big an issue. It however would not be good in competitive play.