eevee- to get eevee, you need to trade from firered, leafgreen or XD
espeon- max out eevee's friendship and lvl up at am
pikachu- found in safari zone: southeast and southwest
latias- after beating the elite 4, pick red in the option (red/blue) or @ southern island
swablu- found on routes 114 and 115
teddiursa- safari zone extension( after beating the elite 4 or in altering cave- ereader)
lugia- navel rock( mystic ticket, event only or action replay hacks)
jirachi- special event,colosseum bonus disk, pokemon channel or action replay hacks.
manaphy- it is ABSOLUTELY IMPOSSIBLE TO GET ANY SINNOH POKEMON IN EMERALD, SO DONT TRY!!!
celebi- from a nintendo event or by using action replay
shiny celebi- same as celebi, but there is a 1/8192 chance of it being shiny, but there
are cheat codes that make those odds 100% of finding a shiny pokemon