The RBY one is much different.
In RSE, the (?) one (the one that looks like the Pokedex thing) is very dangerous, and is only obtained by cheating, or glitch.
If you use the walk through walls code at the beginning of the game, it appears as your default pokemon, followed by an unlimited amount of bad eggs.
It knows no moves, and I believe trying to look at them will cause the game to freeze.
However, the ?? (two big blocky ?s) one is the safe one.
It's stats are relatively opposite those of shuckle, with very high attack and sp. atk and speed, and low other stuff.
It only knows tackle, with no ability.
~nightcat ;197;