you cant
In Pokemon Heartgold and Soulsilver you can get a Johto starter from Professor Elm, a Hoenn starter from Steven, and a Kanto starter from Professor Oak
In Pokemon Emerald, when you complete the Hoenn Pokedex, Proffesor Birch gives you a Johto starter. In Pokemon HeartGold and SoulSilver, after defeating Red, Professor Oak will give you a Kanto Starter and Steven will give you a Hoenn Starter.
Lyra was given it as professor elm trusted her
That is not possible. But there is a way to get another starter. Catch a Ditto and put it in the daycare with your starter. They will have a egg. The egg will be the Pokemon you chose at the beginning. Or you can trade a starter from another game.
After you defeat Red, go to professor oak's lab and he will let you choose which kanto starter you want.
There is no information regarding who receives the last Starter that wasn't selected that Professor Elm had as a choice for 1 of his Starter Pokémon.
beat the main character from firered and leafgreen, then obtain a kanto starter from professor oak and a hoenn starter from steven in silph co.
you cant get a wild bulbasaur in the game you get it as a starter Pokemon from professor oak when you beat red on mt silver
Afterwards, Professor Oak will give you a Generation 1 starter (Bulbasaur, Charmander, or Squirtle)
what starter? you already get a starter after you beated red.-_-
In HeartGold and SoulSilver, she does not battle you - which might be one of the reasons why she doesn't have a starter pokemon. Instead, she has a Marill.
It's a starter Pokemon.