Silver is a Pokémon Trainer who was your Rival in Pokémon Gold, Pokémon Silver, Pokémon Crystal, Pokémon HeartGold and Pokémon SoulSilver and he stole his Starter Pokémon from Professor Elm's Lab and Silver was also confirmed to be the son of Giovanni, the former leader of Team Rocket and the former Viridian City Gym Leader.
There is not a trainer in soul silver that has a chikorita.
No trainer has a phanpy in Pokemon soul silver.
battle with level 100 pokemon
You can't, the trainer always blocks the PokeBall
By trading one from gold/silver and cloning it Dani (the girl Pokemon trainer on Pokemon crystal version) By trading one from gold/silver and cloning it Dani (the girl Pokemon trainer on Pokemon crystal version)
No one
you are not a trainer it simply isn't there
you go to pallat town and go to prof.oak and get a Pokemon
16 badges
Once
It is "the world's best trainer" and a thief.
There are not trainers with a Buneary in SoulSilver.