Elevator Action (Altron/Taito, 2000)
I'm still not sure what to call this genre, but I'm leaning towards "boring and indistinct." Even with three playable characters, this one feels exactly like all the others.
Elie no Atelier (TOSE/Imagineer, 2000)
This is, as best I can tell, a port of the second game in the Atelier series, which originally released on PS1 about a year earlier at the very end of 1998. I played through the first cutscene so I could see what synthesis was like in this version and was very disappointed to find out it's just random chance. Later games have a neat puzzle minigame to make the best possible item, but this early on in the series you just have a percentage chance to succeed based on gear and how much you're making. Still, I might track this down eventually because it was the rare Japanese GBC game with a font that doesn't hurt to read.
The Emperor's New Groove (Sandbox Interactive/Ubisoft, 2000)
Another character platformer, like every Disney game. This one is unique only in that it's impressively unfair. I jumped on to this platform from well off screen and landed on a rat that did two hearts of damage. There was no way to know that was there.
ESPN International Track & Field (Konami, 2000)
I still have my childhood copy of this. It's a series of Olympic minigames that are often, but not always, some variation on button mashing or rhythmic presses. It's simple, but there's a really good variety of sports included and some of the individual games are pretty fun. I still like it.
ESPN National Hockey Night (Konami, 2001)
This ESPN game isn't as good, unfortunately. I have no idea why some shots score and others don't, everyone bumps into each other constantly like they've never been on ice before, and five actual minutes per period is very long for a GBC game. But it does have a practice mode where you can play 5v1, and that's kinda fun.
Evel Knievel (Tarantula Games/Rockstar, 2000)
As you can probably guess from that screenshot, it's a Trials-style game. I have always hated those, and this wasn't the one to change my mind. At least it has a map in the bottom right.
Extreme Ghostbusters (Magic Pockets/Light and Shadow Production, 2001)
The most extreme thing here is the graphics, which have quite clearly decided that green is their favorite color. This was basically unplayable because of all the flickering, but it seemed like the game was basically spinning your ghostbuster gun in a circle and sucking in ghosts.
Extreme Sports with the Berenstain Bears (Magnin & Associations/Sound Source Interactive, 2000)
Everyone talks about the Mandela effect of the Berenstain Bears spelling, but no one ever talks about how everyone forgets they were extreme sports junkies. Here we see Brother Bear skeletoning down a mountain to his death. You can also do this on a bike, or a raft, or a bunch of other things that seemed like basically the same game.
The F.A. Premier League Stars 2001 (Krisalis/THQ, 2001)
Probably the worst soccer game I've ever played. For reasons that defy explanation, they made B a dedicated "show the score" button, which only leaves A for literally everything else. That means you can only ever shoot, since there's no pass button, and that in turn means that the whole game is just players flinging the ball around wildly. It's not even that hard of a shot, so a lot of the time it just ends up dead in a corner of the pitch, and it's hard to score. Half time happened at 49 minutes even though there were no stoppages. Everything about this is a mess and bad. It's even covered in EA Sports logos even though they were apparently not involved.
F1 Championship Season 2000 (Tiertex/EA Sports, 2000)
You get a picture of Michael Schumacher's car instead of a race because it crashes to a black screen after track selection. This is the most I can show. Alas.