There might be an unwritten rule/restriction that prevents frozen Pokemon from getting Dynamaxed. Perhaps that's why it's specifically Gengar that gets hit with Freeze, so Ash can't get around to GMaxing him and go for a big swing.
Either way, with Freeze now in play, every status ailment but Paralysis has been present in the M8, including the flinch scenario, and they've all been in battles with Ash.
Sleep - Hypnosis from Spiritomb
Flinch - Air Slashes from Togekiss
Burn - Will-o-Wisp from Gengar vs. Steven
Freeze - Mr. Rime's move
Poison - Roserade's Toxic Spikes
We could see Paralysis come into play here, just to get blackout on this bingo card.