TM toxic is found in the place where you go to fight the elite four called "mystery road".
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You can only get it if you trade a Pokemon from d/p/pt holding the TM toxic which can be found on route 212. sorry
After defeating Koga the fuchsia gym leader he gives you the TM Toxic
Janine, the new Gym Leader of the Fuchsia City Gym will give you TM06 Toxic as a reward for beating her in a match.
It has always been TM06.