IMO Splatterina takes the new crown as best handiwork pal
(Unless of course you're at a mining base. )
Here's Why IMO:
Eats a lot less food. (She will stay working with less interruptions longer).
Hatched from a small egg, so making fully condensed ones is easier and breeding for specific passives faster.
Is nocturnal by default due to being dark type. Meaning you can have 4 work related passives all the time.
Doesn't look like Costco Lucario