No pictures sorry I didn't think of doing this until I saw many people needed it

 

go to eterna city and talk to prof. rowan to start it

1. go to canalave city and talk to the sailor

2. go hunt down and kill 4 pokemon that an officer tells you (gengar - coronet 4f, mismagius - acuirty lakefront, spiritomb - pastoria, sableye - canalave library)

4. go find 4 pokemon, that you need to use the move wake-up-slap on (celestic ruins, heathrome, sunnyshore, twinleaf

5. go back to fullmoon island and battle a rocket grunt and then giovanni

6. battle a level 120 darkrai

7. go to mossdeep space center and get ingredients to make a potion

8. get the ingredients, moon dust is on the moon, otherwise its just berries - also it costs 50k

9. give the potion to wake up cresselia back on the island

10. catch it

 

all in all this made me spend about 100k total, just going back and forth to pokecenters and boat trips

update in a few hrs with pictures if you're still stuck

Edited March 24, 20206 yr by g3n3r4l

100k? Wow, that a bit of money