Teddiursa
Teddiursa is almost exactly the height of Shuckle.
POKÉMON · HEIGHT & WEIGHT
Shuckle is 60 cm (1 ft 12 in) tall and weighs 20.5 kg (45 lb).

Pokémon names and artwork © Nintendo, Creatures Inc. and GAME FREAK inc. Size It Up is an unofficial fan project and is not affiliated with or endorsed by them. Image source ↗
An average adult stands about 175 cm, so Shuckle is about 34% of the height of a grown-up.
Of the 127 Pokémon entries measured on this site, Shuckle ranks 87th by height.
Teddiursa is almost exactly the height of Shuckle.
Snubbull is almost exactly the height of Shuckle.
Skiploom is almost exactly the height of Shuckle.
This page.
Remoraid is almost exactly the height of Shuckle.
Pineco is almost exactly the height of Shuckle.
Mareep is almost exactly the height of Shuckle.
See all 127 Pokémon sizes, smallest to largest
Numbers are easy to read and hard to picture. In Size It Up you drag a mystery object until it looks right next to a reference drawn at true scale, then the reveal shows how close you came. Shuckle turns up in the daily puzzle at random, and the Pokémon practice set deals five Pokémon at a time.
Measurements are the canon figures listed on the Pokémon Wiki (Fandom) page for Shuckle ↗. Where a character has several forms, the size above is for the form shown in the artwork.