I hate gba games that make you have to link up to other GBA games to get special items. I was playing through Boktai recently and got completely shit on by that GBA connectivity crap. Basically, the hardest dungeon in the game with all the best weapons requires that you collect 7 emblems. The only hint that you get for collecting them is a note that says emblems are gained through 'emblem resonance' with emblem reson.. being differently coloured than normal text to emphasize it. I never got what it meant, so I continued on and after getting fed up with the dungeon never seeming to indicate that I was progressing I tried looking up some tips on getting the emblems. Surprise, surprise, 'emblem resonance' is the game's quirky way of saying "link me up to another GBA, asshole."
Stupid Nintendo. I don't have any goddamn friends to link up to, jerks. Why the fuck do you think I play SINGLE PLAYER video games for?!
BTW, as a tip for anyone looking to play Boktai or any of its sequels, buy it then play the rom. The solar sensor is incredibly awkward to work with and it got on my nerves to play with the sun obscuring the screen. Also, as you need sunlight to play, you are at the mercy of the weather and time when you wish to play. If you can deal with this stuff, though, then go right ahead and play on your GBA. I will fully admit that the boss battles are 10x better on the actual hardware. They're really quite exciting as the game detects various levels of sunlight and this makes boss strength vary quite dramatically. One moment you'll think you have the upperhand, and then the sun will move behind a small cloud for a minute and you'll become significantly overpowered. The boss might even take the opportunity to run so you've have to work frantically to keep it from escaping.