Do you need Deoxys to complete the Hoenn pokedex to get a johto starter?

no because the johto starter is not in the pokedex and its not available in hoenn regionThis answer is not correct!!you don't need Deoxys to get one jotho starter but you can only get a jotho starter on Emerald and not on ruby and sapphirenew answer by: genguwowo

You dont need jirachi either, so your only challenge is getting latiOS and latias. Good luck all !

ZARAXEON