Quote from BobYoMeowMeow;1016837:
Fire Ground would be awesome
you can just have a poke on your team for absorbing water attacks and countering it
Stab Fireblast and STAB earthquake?
he would be one of the strongest offensive pokemon if he has enough speed and attack
Quad weakness to ground though? You could throw an Air Ballon on the Pokemon, but really it's bothersome to worry about the balloon getting popped these days. Although quad weaknesses aren't that bad if you take care of them, obviously if a Pokemon has a quad weakness they better be a glass cannon because having a quad weakness on a defensive Pokemon is not that great of an idea (although Ferroseed/Ferrothorn quad weakness to fire, it has a shit ton of resistances along with some quad resistance too).
Having a quad weakness to rock is the worst since Stealth Rocks will basically take off 50% by switching it in. Which is why Charizard is in the NU tier. But man, choice scarf, modest, solar power in the sun Fire Blast by Charizard with max spec and max speed will OHKO a lot of things, along with most of the water types in the NU tier.
Quote from BobYoMeowMeow;1016705:
fire and grass shouldnt be pure since both types suck
Water is fine pure because it's OP in rain
I don't think Fire types aren't that bad, along with Grass types, especially in the sun, with the right abilities they can outspeed and deal more damage in the sun. Also, a lot of fire types have access to Morning Sun I believe so 66.7% heal in the sun isn't something to joke about. Especially on a bulky Arcanine.
But yeah, have the starters typing not been officially released yet?