During the dubbing under 4Kids Entertainment, the actor responsible for voicing Brock was Eric Stuart however under the control of then-Pokémon USA and currently as of March 2014, Pokémon Company International, Bill Rogers is the actor that voices Brock.
Your question is about their voices? See the attached links.
Brock Baker goes by The Man of a Kajillion Voices.
In Pokemon Red, Blue, and Yellow, Brock has two pokemon, a geodude and an onix.
brock will be a very good Pokemon breeder and he will still help ash in his journey there is more to it trust me i know Brock Is Destined To Be A Pokemon Breeder ( The Best Pokemon Breeder)
Brock is not IN Pokemon ranger!!!!!!!!!!!!!!!!
ROCK Pokemon
yes everyone has a surname even in pokemon and brock also has one but it is not mentioned in the pokemon anime
Geodude and Onyx
Brock, in Pokemon Red and Green/Blue, has Onix (level 14) and Geodude (level 12) as his main Pokemon.
You can catch a grass type Pokemon but catching mankey is the easiest because it appears a lot especially to the east of Pewter (where Brock is). Mankey has the advantage of being a fighting Pokemon which is super-effective against Brock's Pokemon.
The ones who did the voices of the Kanto Gym Leaders and their Pokemon would include Eric Stuart who was the first voice of Brock and Bill Rogers who was the second voice of him and Bill Rogers did the voice of Brock's Croagunk and Sudowoodo, Eric Stuart and Unsho Ishizuka did the voices of his Forretress, Rachael Lillis was the first voice of Misty and Michele Knotz was the second voice of her and Rachael had done the voices of Misty's Goldeen and Horsea while Shinichiro Miki did the voice of her Staryu and Ikue Ohtani did the voice of her Starmie, Michael Haigney did the voice of her Psyduck, Eric Stuart did the voice of her Politoed and Kayzie Rogers did the voice of her Corsola.
croagunk, sudowoodo,happiny (who evolves into chansey).