Quick verdict
Current best Squishy
A definitive #1 Squishy cannot yet be verified from reproducible current-game data.
The public sources confirm how Squishies are unlocked, upgraded, and connected to rarity. They do not provide a named roster, current Cash rates, upgrade costs, or matched test results.
Ranking-readiness verdict: source coverage is partial, comparison criteria require matched observations, exact placements are held, and confidence remains insufficient for a universal ranking.