To Yu-Gi-Oh! ファン

I take it you're referring to Rex Raptor?^^ He was in some,I wouldn't say very many though..If you're talking about テレビ Episode Wise His Debut was Episode in Episode 2 in the first season (I'm pretty sure it was Episode 2)he was also in Episode 3,11,12,58,151 to make easier he was in many of the Episodes in the 150 range like 152,153,154,155,etc. he also continued to episode 160,161,162,and he was probably in もっと見る from those episodes on, I can guarantee he was in Episode 189 also. I just learned something he was in もっと見る Episodes than I thought he was XD
I'm hoping this helps!^^