Trulimero Trulicina

Trulimero Trulicina hatches from the Trulimero Trulicina Egg, a Epic-rarity egg found in the Lake. Lake is zone 2 of 11 on the normal route; the wiki lists its entry requirement as 900 speed, and the nests there are watched by the Swan.

The wiki lists its base income as $260/s, which ranks it 4th of the 8 Lake pets by base rate — Leviathan tops the Lake at $220K/s. Base rate is what a normal-size, un-mutated hatch earns; everything above that comes from the size roll and the colour mutation.

With a colour mutation and no size bonus, the same Trulimero Trulicina would earn roughly: Silver ×1.2 ≈ $312/s, Golden ×2.5 ≈ $650/s, Rainbow ×3.5 ≈ $910/s (multipliers from the wiki's Mutations page; arithmetic is ours). Add a Giant (×3) or Huge (×5) size roll on top and the numbers multiply again.

Hatching it pays a one-off reward of +3k Speed, $26k, and the egg takes 1m 30s to grow in the pen. That reward is the reason low-income eggs are still worth stealing early: the speed bonus is what gets you into the next zone.

Epics are the mid-tier of their zone — a good candidate for your first mutation roll because the base rate is high enough to matter.