A friend and I randomly decided to watch the entirety of Yugioh GX in 2020 since there wasn’t much better to do and it ended up being one of my favorites shows I’ve ever watched, both sub and dubbed versions.
Season 1 - Get Your Game On!
The first season of GX is mostly school shenanigans where one of the teachers, Dr. Crowler (Cronos in sub) is trying to get Judai (Jaden) expelled from the school with methods including but not limited to framing him as a sexual predator. This is probably my second favorite season just because of how silly the filler episodes are, a lot of people say it’s bad but they’re just loser youtube video essayist permavirgins. Around the second half of the season the plot is more focused on the Sacred Beasts and the resulting conflicts around them, it’s still good during that arc but it had less of the nonsense I crave in a Yugioh anime.
Season 2 - The Least Good One
The second season is my least favorite mostly because it takes a lot of side characters out of the main plot and they’re not replaced with anything better. The best thing that happens in this season is that one bit where Sho (Syrus) gets kicked down a staircase while he’s in a trash can, that time he also got turned in to a vehicroid, and Lorenzo. Aster (Edo) Phoenix is also a pretty good character but Saiou (Sartorius) is a faggot with weird hair. The scene where Aster’s backstory is explained got absolutely retconned in the dub which was pretty funny as well, originally is father was killed but the dubbed version had him just go missing since you can’t have people die even though by that point Judai has already killed like 3 people.
Season 3 - Yubel ❤️
In this season there’s a lot more plot and very little filler, its also the point where youtube permavirgins say the show actually gets good and yeah, its good, but it always has been. This time some guy who’s totally not evil named General Cobra who puts bio bands that drain your vril whenever you duel, he uses that to resurrect his son but what it actually does is wake up a demon thing named Yubel that transports Duel Academia to another dimension. Oh yeah and there’s another guy introduced, his name is Johan (Jesse) and becomes Judai’s best friend since he’s another rockheaded teen who loves to duel. Johan gets stuck in the dimension but Judai goes back to save him and all his friends stupidly follow him and get killed and blame it on Judai even though he didn’t want them to go, Judai has an evil moment and then learns that Yubel was his personal guardian in another lifetime, and then resurrected as a duel monster (she killed someone after he lost a duel) who got sent in to space but the dark energy made her evil. At the end they fuse together and Judai gets his own Astral but deadlier and with a hot voice.
Season 4 - The GOAT
Someone on the team really thought of GX as their baby because even though its only half as long and the budget was probably tighter too its easily the best one comparable to Zexal’s second half. I’m not going to itemize everything great about it but its where all the best parts of GX are. Every other episode has a wonderful conclusion to everyone’s character arc and very sweet an emotional moments. The best moment is probably Judai’s graduation duel with Crowler.
Addendum: Bastion Misawa
GX has a character by the name of Bastion Misawa, at first he’s introduced as another one of Judai’s rivals but at some point he goes absolutely mental. During one episode some amazoness woman takes several Duel Academia students as slaves and Misawa goes to duel her, loses miserably and gets raped (then finds out she’s a tiger). From then on he was never the same, he joins a cult and when it dissolves he streaks around the campus, gets a loli fetish, and when he meets his amazon in the alternate dimension during season 3 he stays behind with her and is never seen again.
To summarize everything, you should watch Yugioh GX.