need Pokemon help for pokemon ruby for GBA

[Pokefan111]

I want to add some new pokemon to my pokedex and i got full lvl 100 pokemon so i would like to know is there a way to get Treeko/Torchick(have the mudkip one),Charmander,Bulbasaur, or squirtle and if not could some1 tell me where to find a "Trophius" ty

 

[NoodleChefKyle]

The easy way is to trade with someone who has other versions of the game. But other than that, Tropius is on route 119. It is also, however, a bit tricky to catch with LV 100 pokémon only since they'll make it faint every time (probably).