Centifist, Milleclaw + Cruit, Crastaster

Centifist (Meditite+Kricketot): To keep track of its strength, it throws boulders over a field and notes down how far they can go. If one lands closer that the previous, it's a sign that it's not training enough.
 
Milleclaw (Medicham+Kricketune): All it's muscle atoms are shrunk but are still present in the body*. It can lengthen its limbs as if they were made of rubber.
*this is based on the shrinking thing. If you shrink something, its weight won't change because the atoms are still there, they're just closer together. So even if you had a whale shrunken to the size of an ant, it will still weight as much as a whale.
 
**
 
These are also some of the first Pokemon I ever invented (back when I was a kid), and they've gone through many changes. One thing that never changed though was the claw.
 
Cruiti (Magikarp+Krabby): It uses the claw to crush shellfish and feed on the mollusk within. It is a fairly slow swimmer and isn't much stronger than Magikarp.
 
Crastaster (Gyarados+Kingler): Its tail claw is said to have clean cut ships in half. It does not need a motive to destroy things and will often do it for its enjoyment. They have no eyes and depend on sonar to find their prey, which can get as big as Waillord.