IMO the AV set isn't as good as people are saying. I know tgrowth has regenerator, but going with AV really hurts it on the physical side as you need to invest evs in sp defence and tangrowth has absolutely horrid special defence. The AV definitely makes a difference, but you're really just getting above average bulk on both defences and I believe tangrowth functions much better as a total physical wall. I used to run Knock off/sleep powder/giga drain/leech seed but i've replaced knock off with infestation to try it out. It works wonders when you manage to trap a physical attacker (and is extremely satisfying) but it can be situational. However, i've found that after I've trapped and destroyed a mon (or attempted to) they become wise to the act, but that isn't necessarily a bad thing. They're 95% sure i'm going to try and trap them so they switch into a special attacker or something like talonflame only to get put straight to sleep. I've definitely been having the most fun with this set, because even if you can't trap an opponent it's still an absolutely brilliant physical wall that can make great use of the other 3 moves. I really want to try rock slide because even the mere mention of that overused bird boils my blood, but I think i'd miss the other moves a little too much.