>>56392525Gligar is a worse case because Sandshrew gets the T.M. Dig in basically the same area you first find it, and can learn Earthquake, Rock Slide, and Swords Dance.
Look at Gligar's TM options by comparison: No Ground moves. No Flying moves. There are some OK moves here but man is it barren. You basically have to reset until you find one that can get a good Hidden Power STAB