Throw a masterball.
No.
You can catch them in Viridian Forest as well as the Power Plant
just beat the elite four
This is completely impossible.
i know you can buy it with your casino tokens
Same thing as finding it in blue version
There's nothing left for you to do.
You can't catch him on that game, but you can catch him in Blue or Red version.
you cant catch venusaur in Pokemon blue you pick at the start of the game out of charmander bulbesaur and squirtle if you want venusaur you pick bulbesaur
There are no wild Starmie in Pokémon Blue Version; to obtain Starmie, use a Water Stone on Staryu.
You can catch Chimeco at Mt. Pyre summit, in the grass near the couple you recieve the red/blue orb from
You could either trade from red/yellow version or I have heard rumors of videos that tell you about a glitch to catch him.