How do you do the Maple Story Quest Monster Riding

for the lv 70 pig, you just have to talk to kenta to start the quest.

The first part is to protect the pig from aliens while at the same time collecting pheromones (dropped by pig) and scrolls (break boxes). There's no limit on how many times you can try.
Kenta gives you the saddle and skill Monster Riding as a reward.

Second part is where you pay Chief Tatamoto in Leafre, pay him 20m and he'll give you dragon's perfume bottle. go back to kenta and he'll fill the bottle with the pheromone perfume

Run to Korean folk town- tiger ridge and go to the secret area Wild Hog Area.

when you see a hog spawn, double click the perfume bottle near it and "capture" it. [hard to miss]

if you missed, re-pay 20m to chief tatamo and try again.

:)