PokÃ mon evolve to turn into different PokÃ mon from the same evolutionary line . All PokÃ mon can be placed at one of four evolutionary stages ( though no existing PokÃ mon line includes more than three out of the four stages ) : Basic PokÃ mon , Stage 1 PokÃ mon which evolve from Basic PokÃ mon , Stage 2 PokÃ mon which evolve from Stage 1 PokÃ mon , and Baby PokÃ mon which are acquired by breeding certain Basic or Stage 1 PokÃ mon and hatching their eggs . A PokÃ mon higher up on this evolutionary scale is called an evolved form of the previous stages ; a PokÃ mon lower down on the scale is said to be a pre-evolved form of later PokÃ mon in the chain .