Question

1. UU or OU
2. stat total over 500
3. no egg moves moveset
4. no legendaries
5. it's to be used in-game in white
6. national dex pokemon

Answer 1

Well Conkelduur is a fighting type that fits all criterias appart from last.
Other than that there are Blazkin, Infernape, Herracross, poliwrath, machamp and Gallade.
They are your only options