End game with Delphox and I'm confused to why she is bottom tier for you, Doof.
She's not much slower than Greninja and beats him in specials, on that note she walls pretty well most specials that she's not weak against. Set her up with Calm Mind, Fire Blast, Shadow Ball, and Psyshock and you've a decent threat, still needing to avoid the water and some dark types (coughGreninjacoughTyranitarcough). But you could switch one of those for Grass Knot or Solarbeam for better coverage against her weakness, preferable the former. I wouldn't suggest removing calm mind, even with really high SpA, as she needs that boost to OHKO. She would really really really benefit from a good fairy type move.
I would give her mid or low tier, but not bottom.
Pangoro, I'd give low tier. He's crazy with attack and eh with speed. EV train in speed could...might....ummm...may be possible to help but I'm not too sure. Quick Claw with Power-up Punch sounds good, haven't tested it online against others though.
Dragalge...I love and hate him...great type combo, okay type coverage with attacks, special wall and attacker, but that speed...He'd be amazing on a trick room team and probably also mid-low tier too. He's a good counter to go against fairy types, but it stopped by both Mawile and Klefki. The types he's weak against are also generally faster than him and he has decent defense to hold up against some but most of the time it's a OHKO.