What are the best weapons to defeat the Malice Bopper? I've won 5 times, but we keep tying now because I can't heal.

Full blockers combined with bombs. Shinwa Temple Shard, Rainbow Vortex and Amulet of Neutrality are full blockers, check the Tier of your pet to see if you can use/get full block from them. Best bomb will be based on the Tier of your pet. Other than that, weapons that block physical, fire, dark and/or wind can also help keep you alive. Heal your pet after each win so you go in with full health.

You've received some solid advice above. I used Shinwas Lightning and Maniacal Essence as my main two weapons against Maliss Bopper. I used Fatal Fire Scroll x 5, Spacial Abyss Scroll x 2 and Sancturia Exodin Scroll x 2. I think you'll do well if you are able to block physical, dark and fire with your main weapons and scrolls.

I have a tier 12 pet...which bombs would be most affective?

I got the 6th win using the scrolls. I'll add the rainbow vertex to see if that helps get another win. Too bad the weapons mentioned are unbuyable. I may have to wait until next year. Thanks for the advice.

Bear head bomb and Thunderball. More affordable are: Potion of the Robot and Potion of Phoenix (in the battle token shop). Other affordable are Acorn Bomb and Item Hunters Bomb.

You can always ask to borrow in battle chat or weapons leading thread.

I'm happy to loan weapons/scrolls to you if you replace the mod crystals on the two main weapons. Just let me know.

I did it!! I think it was the potions I had them in my vault, but they weren't in my current set. Thanks for the advice!
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Congrats! Happy to help :)