Pokemon have their Pokerogue Passives and Egg Moves, as seen on the
Pokerogue Wiki, in addition to their regular Abilities and Moves. This makes them (usually) much stronger. Moves gained this way can be used regardless of what level they are.
Some examples involving BBP staples would be;

Aerilate, Dragon Hammer, Hyper Voice, Calm Mind, Crush Grip.
Crush Grip is really good, especially on a pokemon with high attack and a newly gained Aerilate.

Rocky Payload, Mach Punch, Drain Punch, Ice Hammer, Double Iron Bash
Doesn't get as great of a deal, but let's be honest, it was already doing fine, and Double Iron Bash allows it to hit fairies much harder. I think Mach Punch is new also...?

Scrappy, Drain Punch, Knock Off, Psychic Fangs, Triple Axel
Drain Punch is good, and Scrappy lets you hit ghosts. You also get the coveted knock off, and the other 2 moves are nice coverage.
On the other hand, pokemon that arent as great normally but gain a LOT here.
CAPs are kind of scuffed seeing as there is nothing for them to draw from...

Dark Void can be attempted by non-Darkrai pokemon. If the user is Darkrai, Dark Void's Accuracy is 80%.

The following moves which aren't in the DAT are available to specified pokemon, due to them being available on Pokerogue. Unless otherwise specified, they are 4 EN, and are Any One Target.
Baddy Bad: Dark, Special, 8 BAP, 95% ACC, 5 EN. Creates the Condition created by Reflect on the user's side of the field.
Bouncy Bubble: Water, Special, 6 BAP, 100% ACC. When the user successfully completes this move: The user heals HP, equal to two-thirds (x2/3) of the damage dealt to defenders with hits.
Buzzy Buzz: Electric, Special, 6 BAP, 100% ACC, 100% EFF. Effect Check: Inflict Paralysis with two (2) Strain on the Defender.
Floaty Fall: Flying, Physical, 9 BAP, 95% ACC, 30% EFF, 3 EN. Effect Check: Inflict Flinching on the Defender.
Freezy Frost: Ice, Special, 10 BAP, 90% ACC. Reset the Stat Stages of each Pokemon in play to 0.
Glitzy Glow: Psychic, Special, 8 BAP, 9%% ACC, 5 EN. Creates the Condition created by Light Screen on the user's side of the field.
Sappy Seed: Grass, Physical, 10 BAP, 90% ACC, 6 EN. The rest of the text is Leech Seed. Reflect: Yes.
Sizzly Slide: Fire, Physical, 6 BAP, 100% ACC, 100% EFF. Effect Check: Inflict Burn on the Defender.
Sparkly Swirl: Fairy, Special, 12 BAP, 85% ACC. Remove all Major Condition from the user, their allies, and their benched teammates.
Splishy Splash: Water, Special, 9 BAP, 100% ACC, 100% EFF. Effect Check: Inflict Paralysis with two (2) Strain on the Defender.
Zippy Zap: Electric, Physical, 5 BAP, 100% ACC, +2 Priority. While performing this Move: The user's Critical Hit Stage is increased by 3.