The only thing confirmed is that Diglett possess feet. This was mentioned in Pokemon Mystery Dungeon, by a Diglett. Also, it is listed in the Pokedex as a "Mole Pokemon", so it would probably look at least somewhat mole-like.
The Pokemon that has the POKE POWER flame body is Magmar which you can get either from Pokemon platinum or by transfer from Pokemon fire red
the Pokemon that have flame body are mostly magmar,torcoal or slugma
There are serveral yellow body pokemon. I think what you're thinking of though is Pikachu.
koffing
Flame Body is a Pokemon ability, so it is not a TM. Flame Body is not a move either. The Pokemon that have this ability are: Magby Magmar Magmortar Slugma Magcargo
body slam is.
If you mean Flame Body, then only Magby and Slugma (along with their evolutions) have it.
...Pikachu??
Pikachu
You have to walk around with it. It will hatch faster if you have a Pokemon with the ability Flame Body.
Flame Body is not a move, it is an ability.
you cant they get it by the body trait