For what it's worth, Nuzlocke mode only enforces the permadeath of mons, so it's worth having on as it also gives some extra shop stuff (iirc nuzlocke balls are basically cheap great/ultra balls, esp. nice in randomizer) and you get a special badge/thing if you make it to the end with the mode still on (whiting out automatically disables the mode and lets you continue normally). Though, to re-enable it now you'd need to restart which would mean different starters etc.
Speaking of starters, that Darm could be delta, so hope to see that. Eevee should also be randomized though.
(also regular game randomizers aren't just 1-to-1 replacements of mons in an area, they can pack the encounter tables much more heavily so you've usually got 15+ pokemon in every area, but still it's not completely random each encounter like this. that requires active randomization to be running as you play, so something like an AR code for a regular game)