Wave Convoy versus Megatron happened in Transformers Wave Riders episodes 2, 7, 8, 13, 22, 27, 38, 40, 41, and the running battles of the season finale in 49-52. The record stands at Megatron 5, Wave Convoy 2, tie 3, unless you want to count each group battle they were both in rather than mostly-solo duels, which is practically every episode. For XO vs. Boss it's respectable. VA nd promo tour pay was a major part of what funded turning the Gnarlycurl from a bare metal spaceframe into a habitable ship.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows