Boktai 3- Sabata's Counterattack. It was Japan only, but i think it was DarthNemesis who translated it. So kudos to him! It's a great game, continuing the traditional solar sensor Boktai games, the previous two of which were released in America. I guess sales for those failed or something, because we never got 3. Or maybe it was because the GBA was on its way out by that time. Great game though, the game is pretty much 98% translated, minus a few menu things. You can get a solar sensor patch too.
Dragon Quest Monsters: Caravan Heart. Nice entry in the ever-improving Dragon Quest Monsters spinoff games. I thoroughly enjoy them, excellent Pokemon alternatives IMO. Completed 100% translation hack released not too long ago.
That's all i can think of that received a translation. There was a Mother 1+2 compilation port to GBA of the NES and SNES games, but a full translation was never made for the Mother 2 portion. You can get both games in English on their original systems anyways.
There was a spinoff of the Megaman Battle Network series which never got a US release or a translation- Rockman.exe 4.5 Real Operation. Kind of a mix up of action and turn based gameplay. Not a main story or anything from what i saw.
And then there was a third game in the Summon Night Swordcraft Story series. Summon Night Swordcraft Story 3. Like Boktai, the first two games were localized, but the third was not. Again, either poor sales or because the GBA was dying at that time. But it never got a translation. These games have similar gameplay to the Tales games, the battles at least. You can make your own weapons and such. Check them out if you haven't, they're pretty fun.
And lastly, there was one or two Fire Emblems on GBA that were Japan only IIRC. I don't know which ones were not released, and i don't think they received translations, but maybe they did. Not kept up with the series or which games are which.