XD/Colo - Perfectly legal Pokemon with an encounter type mismatch

[Araraura 12]

I'm trying to create a Lapras that originated from XD/Colo. Everything is completely legal, but I always get "Encounter Type PID Mismatch". I tried using RNG Reporter to generate a PID with the right nature, IVs and gender, but I still get the error. I even went to the encounter table, and I still get the error without even making any changes.

[Kaphotics 921]

Nature Locks not satisfied.

[Araraura 12]

Just now, Kaphotics said:

Nature Locks not satisfied.

What?

[Ammako 181]

Don't use rngreporter main window, use gamecube time finder.