What Pokemon should I put in my team?

Hi, I want to replay Pokemon Platinum but i am missing two team members. My current team is:

• Empoleon
• Luxray
• Mamoswine
• Magmortar

Please could you write me propositions what pokemon should I include in the team. Please don't write me common Sinnoh pokemon (f. Ex. Garchomp, Roserade, Stadaptor, etc.)