Does anyone know any good and any heavy combos because I'm having a tournament with my friends

Perfect / Dead Phoenix Sting Charge weighingmjn at 71 grams

If you just want a heavy bey, and assuming you're looking to buy parts as well, just getting Revive Phoenix and Dead Phoenix to make Perfect Phoenix 0 Atomic from those two beys will put you off to a great start.

If you need combos based on parts you already have, you should ask this again in the "Build me a combo! #2" topic in the Beyblade Customizations forum. This one is not specifically for customization advice.

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Spoiler (Click to View)

This is what we all want, Brad.