The default rarity is the minimum when a pet is learned. For wild pets this is usually "poor". Pets from other sources can be common, uncommon or rare by default.
Source:
Drop
Expansion:
Battle for Azeroth
Owned by:
59.9%
Based on this many collections: 28782 Players who own this pet have it:
Once: 82.99%
Twice: 11.65%
Thrice: 5.36%
Strategies:
2
Popularity:
Low
Pageviews:
934
Breeds:
HP
Aquatic
Harmful damage over time effects are reduced by 50% on Aquatic pets.
50% vs.
33% vs.
33% vs.
50% vs.
Scuttle was named after the ships he destroys, not his movement patterns, and don't you forget it.
Source 
PvE 
PvP 
Other Info 
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