I personally can't do royal flare as anything other than marissa A. Which I'm sure you know how to do, stay low, go up thru one loop of red bullets, then stay stationary (I normally have to go back down though) as the bullet loop on the right side slips left of you, go back down. She should croak shortly after bullets start spawning right at the bottom of the screen.
Cranberry trap I'm actually pretty good at I think, on my replay I screwed it up badly. That was just some finger slipage. I don't know if my strategy works for everyone but for me it's like this:
1: don't worry about purple bullets, they a piece of cake.
2: blue bullets are aimed (or seem to be), so try to be as high as safely possible (don't forget flandre moves though, I've gotten body-check killed by her a couple times, doh), slowly move down as needed as they shoot.
3: once purple bullets start spewing out again, you can move down a bit more as all the blue bullets fly harmlessly past. Repeat ftw.
4: If things aren't going well and your "flying high" for the blue bullets isn't very high at all, don't feel bad hugging the bottom during purple bullet phase. The blue bullets should never hit you there if you weren't hugging the bottom completely while they were shooting, and the purple bullets tend to be spread out pretty wide at the bottom so you can just park between their shots, even as they are shooting from the bottom.
Four of a kind I capped on my first and second attempts on flandre... now I can't seem to cap it. You can kill her clones but they seem pretty beefy, I don't think they actually dissapear any faster than the real flandre does in this phase. I do notice though if you can make it past the 2nd "big bullets instead of small red bullets" shots, it gets easier. I personally find dodging them big ones a whole lot easier than the countless little ones.
I DO notice though that neither flandre or the clones move a whole lot during this phase. I mean they can, but they don't seem to as much. So you may want to look at them while you're in a safe spot and wait until they move before you worry about dodging more, or else you just might psych yourself out.
Maze of love.. This is one ability that really makes me think I should get a gamepad. I just can't circle well with arrow keys. Sometimes I can do it, but after her first 450ish degree spin of blue bullets, I can't seem to get back into position for her orange/red bullets afterwards fast enough, and bombing on this phase is so damn awful because it only seems to make flandre invincible for longer than yourself, to make matters worse it's very hard to see where the "safe area" is after a bomb. I do know though that if you can spin around her until you're around 10 oclock, you can bomb, and she wont really start shooting again until the orange/red bullet phase (giving you a chance to be in position back under her so you can actually shoot her too.
I still found that just staying under, shooting her as long as possible, dying, and shooting more is the best way for me though. I just have it as a given that the move WILL kill me. Better to kamikazee it than to risk dying 2 or 3 times trying to do it properly for me.
Catadioptic owns me too. People say it's pretty easy in the bottom right cornerish.. But I still find this move to be a doozy. I really don't know what to say.