All depends on u and the Pokemon and there stats.
For starter teams:
-blastoise/vaporeon
-charizard/arcanine
-venusaur/vileplume/eggecutor
-dragonite
-snorlax
-pidgeot/dotrio/fearow
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Charizard, Entei, Moltres, Rapidash, and Arcanine are good examples
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
goldeen is one of the Pokemon
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered