Shore Crab
Source: Pet Battle. These arthropods line many Azerothian shores and seek to fulfill their one true desire: to pinch. Aquatic type. There is a lot of shore crabs level 3-5 in Azshara, so if they're giving you a hard time at higher levels, you can capture the baby ones.
The Shore Crab is a wild Aquatic pet found on various shores across Azeroth, captured through pet battles in the wild.
Guide awaiting review
Find Shore Crabs in Azshara
Azshara has a high concentration of Shore Crabs at levels 3-5, making it an ideal location to capture one if higher-level crabs elsewhere are proving difficult to fight. Be aware that many of them are positioned in water, which will frequently trigger the 'Pet battle area is obstructed' message, so target crabs on dry land when possible.
Prepare for Aquatic Battles
Shore Crabs in areas like Borean Tundra are encountered at higher levels and will repeatedly use Surge to attack first each round while also healing themselves, so bring pets that are strong against the Aquatic family to avoid drawn-out fights.
Check Pandaria for Safari Achievement
Shore Crabs appear in Krasarang Wilds in Pandaria as secondary pets, but you do not need to capture one specifically in Pandaria for it to count toward the Pandaren Safari achievement.
Tips
The Shore Crab is available in P/P, S/S, and H/H breeds, with base stats of 8.5 Health, 8.0 Power, and 7.5 Speed.