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Tm 06 is toxic. You can find it in fiery path. You need strength to get to it however, and possibly rock smash, i am not sure about that. Anyways, go up or down the fiery path (try to bring a repel or two along) until you see a boulder. Then move the boulder, and the remaining boulders as well to the side. t is like a puzzle. Do not trap yourself away from it, but if you do, just get out of fiery path and try again. You can also find a fire stone this way.
after winning your third gym badge go to route 111 and use hm06-rock smash turn left up the stairs and turn left then go up into the opening which is the fiery path.
The fiery path is on route 112
fiery path is in rout 112...
A Pokémon needs the HM move of Strength in order to move the big boulders. You can find the Strength HM in the Rusturf Tunnel.
You can move that boulder by using the hidden move strength.
You answered your question in your question. You find Grimer in the Fiery Path.
from forth day's path and titan's fiery wheels
Past the desert if you go west you should find a cave that's fiery path.
The Fiery path dungeon is located on routes 111 and 112 in Pokémon Ruby. Players can get rare items in the Fiery path.
route 112
You have to beat the gym leader in Oreburgh city.