You can do this by yourself it is very easy I do it a lot as well as getting eggs to trap one just float above the earth scar use a spy glass to see a low lvled dragon which is best cuz it takes less to knock it out so you can get the milk faster but just wait till you see one fly near it and run it will Aggro you you don't have to hit just fly out and to your trap if you have a 200% or higher argy you need to stop every once in awhile to keep aggro not worth chasing to get back have a key pad makes it 100 times easier fly in one side out the other close gate knock out job well done
I got a level 150 lightning egg and I was so excited to hatch the egg...that when I went to put the egg down I accidentally ate it instead. :( ps4 users: R2 ISN'T GONNA DROP THE EGG YOU'RE GONNA EAT IT LIKE ANY OTHER EGG. REMEMBER THIS. LOGIC BEFORE EXCITMENT.