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Ground/Normal with the Levitate ability. Most Jolteons carry at least two of these moves: Thunderbolt, HP Ground, Shadow Ball, HP Grass. Give the Ground/Normal an Enigma Berry or a Grass wekening berry, and it's an anti Jolteon.
Water/Fire: Blastoise alternate evo, like a 5th gen stone or something used on Wartortle. It gains a Ground and Rock weakness, but loses its Grass weakness and would probably be able to use Flamthrower or Fire Fang. All that in addition to looking awesome.
Grass/Ghost: IIRC, this one...
If Char was Dragon/Fire, though, Hollow would lose half of his reason for existing. GameFreak would never do that to me.
Besides, it's been four generations.
Mehbeh all the starters should receive an alternate third evolution with awesome typings and better movesets. Like an alternate...
Okay. First things first. If that Base 150 STABed move is Blast Burn, then no. Just, no. Blast Burn is a horrible move. Personally, Choice Band Ty is damn powerful. It can seriously injure SkarmBliss and can definitely take out a Ttar. However, no one uses these for obvious reasons. Ty...