[G] Spider Web
Flip a coin. If heads, the Defending Pokemon can't retreat. (Benching or evolving that Pokemon ends this effect.)

[GGG] Poison Bite (20)
If this attack damages the Defending Pokemon, the Defending Pokemon is now Poisoned and you remove a number of damage counters from Ariados equal to half that damage (rounded up to the nearest 10). If Ariados has fewer damage counters than that, remove all of them.