I just noticed the current rare machine conditions, decided that I was tired of sitting on these stones, and tried twice on the rare machine fishing for a good Light monster to replace my crappy one. I didn't get a light creature, but I did get a +1 Slyph and a Lovely Maiden, Princess Valkyrie. Are either of those any good? Valkyrie seems kind of neat, but she costs as much as my entire team right now, so I don't know if she'll be exceptional by the time I can actually use her.
Ahahahahahahahah you got a valk so early :getdown:
Valkyries are great. Use her as you please.
Sylph is situationally good for its skill, I suppose?
Also, what are metal dragons for?
Literally EXP fodder. Small metal dragons are pretty much worthless though, at only 1000 EXP a piece. Just fuse them on to weak stuff.
Also sometimes used as evolution material.
Are the snow globe dragons any good for battlin', or are they just food?
Snow globe dragons have good leader skills (they basically have the same leader skills as the Archangel series, x2 HP and RCV for their color, which is pretty great when you pair it with a friend of the same kind), but overall have poor stats. Use them as EXP fodder on the same color. (It's 1,000,000 EXP at max level for off color, 1,500,000 for same color.)
Should I be doing anything with the space invader-looking guys from the current collaboration? I got a blue one, is it useful for anything?
For the point where you are, collect the red and green ones and evolve them. Double Attack Stance skills are super useful.
What are the odds your skills will power up when you feed something with the same skill? I fed my Pyro Demon something else with Bomb that I got out of the Pal Machine, but I didn't notice that his Bomb got any better.
Low. Very, annoyingly, extremely low. This is one thing that makes me really angry about PAD honestly, because it's so intentionally obtuse and difficult to do sometimes. Especially for REM monsters who only get skillups only from invades (aka "random appearances") in event dungeons. You'd be lucky to get one or two and extremely lucky for the skillup to actually happen.
EDIT: eh, chaore beat me. Whatever, still posting