You must have a female starter. Then, put it in the Day-Care with another Pokemon in its Egg Group(Example: F. TREECKO + M. ROSELIA = TREECKO EGG) You can use this to make Pokemon with special moves called Egg Moves.
You can't, but you can by breeding Pokemon or trading. However in Emerald you can by duplication
The starting pokemon for pokemon ruby, sapphire, and emerald are all Torchic, Mudkip, and Treeko. Irepeat, Torchic, Mudkip, and Treeko.
torchic, mudkip and treeko
Breed a female pikachu with any Pokemon from its breeding group or any pickachu with a ditto.
Inside an egg is a baby Pokemon it depends on what two Pokemon your breeding for example: Take a ditto and raichu you will receive an egg hatch it to receive a pichu. Like Pichu some other jotho Pokemon can only be obtained by breeding Pokemon.
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if your just starting he is in petalburg city
Meditite is in Ruby, Sapphire, and Emerald. It’s Psychic/Fighting and evolves into Medicham starting at level 37.
Pokemon ruby's version IS Pokemon ruby.
you can not change your own name without starting over
Marshtomp evolves into Swampert starting at level 36.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.