Munchlax's comfortable scratching

Look! Munchlax was having a nice comfortable scratching 

means Munchlax likes to scratch itself. 

In "Pokemon Movie 7: Destiny Deoxys" Munchlax was scratching itself 

after it ate some Crumbs during Lunchtime and jumped high and stomped on the Ground. 

Munchlax scratched itself while it was handing out a Sandwich to 

Max, Audrey, and Kathryn. 

In Pokemon XD; Gale of Darkness, 

Munchlax liked to have a nice comfortable scratching 

after it ate some PokeSnacks.