Its a pretty good stage 1 but not strong enough to base a deck on.
It has a high HP, but since DP th average HP has increased for stages, as well as the damage, so 90HP isnt so great against the newer cards. Bottom stats are also good, but its attack and power will lead you astray.
It has 1 attack. Which does 30.. Hmm. that is lame. But ooh! it does guaranteed poison, making it 40. However this will likely be out early/ mid game if played (not including a sealed- which it would pwn) so it is likely that the opponent will simply switch to remove the effect.
Once the opponent is poisoned, you have to switch Toxicroak yourself for a more powerful hitter otherwise its back to doing 30.
7/10
To whoever asked, all poison types are now written as Psychics btw.