Are there examples of good walls with bad type combos? (Not including Steel)

As the title says. A mon with a bad type combo but works as a wall in spite of that.

Doesn't have to be OU. UU works

Atm only one that comes to mind is Cradily. Two bad defensive types but together they balance each other's major weaknesses. Though Grass/Rock doesn't exactly count since it only has 4 weaknessess