only deoxys
I Think Only By Leveling UP
Certain Pokemon learn it by leveling up, such as tentacool. There is no TM and no Tutor, so you might want to check serebii.net's attackdex to find out what Pokemon can use it and how they learn it.
Any animal that can learn dig, like a ground type (gible)
Altaria and Shelgon will make Horsea learn dragon breath. This move can also be learned leveling up in the Pokemon games.
i think gravler can and almost all the rock types numel can also learn rock slide by leveling up to lv 33 but u have 2 let it evolve into a camerupt
Deoxys can learn Psycho Boost
It automatically has psycho boost.
Level 1
No, Mewtwo cannot.
In Pokémon Pearl, there is no way for you to get the Psycho Boost attack unless a Pokémon knows the move and the only Pokémon who can naturally learn the move is Deoxys.
no Pokemon can learn rock smash by leveling up you have to get the hm.
he learns it level 75
No..the pokemon dnt learn it by leveling up but some do learn upon using the TM..:)
Ninetales and gulpin have like 20 moves each by leveling, starter pokemon also learn many moves by leveling A pokemon can learn better moves if you neglect evolving it for a while, vulpix can learn inferno at level 50 if you can hold out on giving it a fire stone until the . (Inferno is a great move)
bannete or clefable
Yes
Sing is not a TM (Technical Machine). It is a move that only certain Pokemon learn. You can only learn it by leveling up certain Pokemon (Skitty, for example, learns Sing by leveling up).