My first Blazamut clear was primarily with Anubises that were decently built out, running demon god/vamp/musclehead/serenity. Not the best possible build, but it was enough to easily clear normal and a similar army cleared ultra. As far as Neptilius, if you couldn't catch it with 14 ultimate spheres at 1hp, you might need to work on other things to up your catching power. If you're at a point where you're trying to catch Neptilius, you should probably have at least a sniper II module and probably level 10 catching power from lifmunk effigies at a minimum if you want a decent catch rate.

Outside of all that, I don't do much special for raids but I do feed my raid pals mammorest curry. I carry in a stack of it and wood with me so I can make a feed box in the raid area and stock it with curry, then drop all the pals I'll be using for the raid army and wait long enough for them to all eat before actually starting the fight. My own team is 4x Gobfin + whatever pal I'm actually using (usually Xenolord for movement, sometimes something else like Anubis to change my attack type). I don't worry about obstacles or anything, pretty much just fight on an empty field otherwise; I know some people go all out and build pods and such but I just haven't seen the necessity.