I'm tired of searching Blue Shards on dust clouds, I always find other shard or onix/excadrill/drilbur, I want teach Aqua Tail to my Serperior but I have only 2, also Dark Pulse to my Hydreigon
There are several ways of obtaining shards, I'll list them here:
One way to find shards (and other items) is by using the dowsing machine. You may not always get shards, but there is a good chance.