For me:
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Super Robot Wars (Gameboy)
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Berserk Millennium Falcon Arc: Chapter of the Holy Demon War (Mouthful, PS2)
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Gundam Battle Assault (PSX)
I love Super Robot Wars, it's the perfect you got peanut butter in my chocolate game. It mixes a dozen different giant mecha ips into a tactical roleplaying game.
Berserk on the ps2 is awesome. It takes the musou formula but imo makes it something much more engaging, plus it faithfully retells the best arc of the manga.
GBA is a great 2D fighter by natsume, carries on the tradition of the gundam wing game for the super famicom but this time on a 32bit system.
Great game, but I only ever borrowed it from my cousin and didn't get very far. The mission to scout out the gundam and white base was a brick wall.
I still suck at the game as an adult lol. It works with the source material for me in the same way sucking at TIE Fighter does - bad guys punching in the clock to get wrecked
It's still a cool game it's the closest we've got to real mobile suit tactical combat.