>>47282099Swampert is good because it has a lot of good moves and the game it debuted in has a shortage of Grass-types, which don't appear often. The only prominent Trainers I can think of with a Grass-type that can threaten your Swampert are Rival and Steven, and RSE Rival is a joke that stops training around Lilycove. You'll never even see Sceptile. Steven's Cradily is a threat I guess.
Charizard was considered to be functionally terrible for years, so I don't know why you're listing him except to fill out a list just to do it, but it's not like Green has any Pokemon with Rock-type moves, as far as I recall. Giovanni might. In X/Y you probably won't have a Charizard by the time you have to deal with Rock-type stuff. Competitively? It used to lose most of its HP to the most common entry hazard.
Torterra is what I was expecting people to mention when this first got off the ground, but not because it was x4 weak to Ice, the best Offensive type (which now hits hypothetical Typhlosion neutrally too.) But because Torterra is neutrally damaged by Water and it doesn't even matter because it has the moves to offset it.
The point I'm trying to make here is that it isn't just about slapping another type on Typhlosion. Typhlosion's issue is its lack of good moves. I understand though that giving it a Ground-typing gives it access to STAB Earthquake and maybe Earth Power depending on what set you want to run, but I took issue with that anon's post because making it a Ground-type also comes with a number of other issues, and I can see why someone would have a problem with it. Typhlosion is not Garchomp, Swampert, or Torterra.
The difference between Fire/Ground Typhlosion and Swampert is vast. Swampert is that good in RSE.