I saw no topics about these moves, but I reckon they're worth discussing.
From Serebii :
Electric Terrain (Electric, Status, 10PP) : The user electrifies the ground under everyone's feet for five turns. Pokémon on the ground no longer fall asleep.
Grassy Terrain (Grass, Status, 10PP) : The user turns the ground under everyone's feet to grass for five turns. This restores the HP of Pokémon on the ground a little every turn.
Misty Terrain (Fairy, Status 10PP) : The user covers the ground under everyone's feet with mist for five turns. This protects Pokémon on the ground from status conditions.
Grassy Terrain seems to be the most useful of the three, could be a great support-move to carry on stall team for that added recovery. That said there are hidden effects, for instant Misty Terrain supposedly reduce damage from Dragon-Type attacks for it's whole duration (according to a NPC anyway, I couldn't test it).
Thoughts?