Does the hidden ability need dream world? If so I can't get it.
it depends what type of tangrowth attacker tank?
I use to run defensive tangrowth
Nature: Bold / Relaxed
Do you want EVs then just do a comment ok :D
[EDIT] EVs 252 HP / 252 Def / 4 SpA
There you go
That's what hidden ability means.... Obtainable in the DW. But in B/W 2 on Route 13's Hidden Grotto there is a 4% chance to find a Tangela in there.
http://pokemondb.net/pokebase/11867/what-is-a-good-moveset-for-tangrowth movesets for a Tangrowth.