What pokemon should complete my heartgold team?

You need a good gr type. Venusaur is the absolute best, but it might be hard to get without a friend who has already finished the game. I like Victreebel too but it's not nearly as strong as Venusaur. Since you don't seem to care about using legendaries, you can use Celebi, too, but it's even harder to get. Ludicolo is good also, but it's half water which is a drawback, and you have to use TMs because it has terrible moves. You could also use fighting, in which case Hariyama is the best. Ghost is good too, but I wouldn't put one one your team.