Rainbow Slime is Paldeck #10006, a Neutral Pal. The most accessible combo is Green Slime + Rainbow Slime, one of 17 parent pairs that produce it.

Neutral HP 105ATK 95DEF 105 Transporting 1
Plan a breeding route from YOUR Pals →…plus 7 more pairs — the planner finds the fastest one from the Pals you own.
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Breeding power 3100 · gender ratio 50% ♂ / 50% ♀ · all combinations verified against the Palworld 1.0 game data (post-rebalance — many older calculators still show Early Access combos).
Open the free planner — reads your save, never uploads it