Why and when does Professor Birch, in ORAS, give you a starter from another reigon?

Dec. 19, 2014

So far I have gotten a gen 3 starter, a gen 2 starter, a gen 5 starter, and a gen 4 starter from professor birch, however, I have not gotten any more starters from him. What I am wondering, is there a certain action you have to perform, or certain criteria you need to meet, to get a starter from another generation?

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Hoenn Starters- Save Prof . Birch from a Pocheyana

Johto Starters- Defeat the E4 and Prof. Birch will call you after you leave your house. He is under attack by a Shroomish and asks ypu to help him by choosing a starter from his bag -_-

Sinnoh Starters-Deafeat the E4againand the same scenario will happen as it did for the Johto Pokemons - but instead of Cyndaquil, Totodile and Chikorita you’ll get Turtwig, Chimchar and Pliplup

Unova Starters- Complete the Delta Episode and come put your house and Prof. Birch is being attacked by a Machop. He asks for help and allows you to choose a Unova Starter

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