123 is hippodown which you battle against in the elite 4 (the second trainer) and number 4 is chimchar which you can select for your starter but by the way it sounds your pretty far so you'll just have to battle somebody in the game who has it or trade a friend
(in Pokemon Pearl?) can catch it in snowpoint cave (in snowpoint) you have to go all the way down then you will see regice but you need to have beaten the elite 4
You can't, Zoroark is a Gen 5 Pokemon, and Pokemon Pearl is a Gen 4 Pokemon game.
Pokemon legue
In Pokémon Pearl, you can see Shroomish in the binoculars at Route 4. It appears in the grassy area towards the top left corner of the binoculars' view.
no. Saphire is generation 3 and pearl is generation 4
Pokemon #4 in the National Pokedex is Charmander.
Check to see if you can transfer your Pokemon from Leafgreen to Pearl (I don't think it works that way though); but I do know that once you defeat the elite 4 you're able to go to the pal park and migrate 6 Pokemon a day.
See all 150 Pokémon and beat the elite 4, then talk to Proffesser Rowan.
Unite 4?
there is no battle frontier in Pokemon pearl,but there is a battle tower. you can go there after you beat the elite 4
beat the elite 4.
HM 4