>>21901565Dialga's stats dumped from the ROM's files:
Index: 483 - Dialga
Stats: 100/120/120/150/100/90
Type: Steel/Dragon
Catchrate: 3
Stage: 3
EV Yield: 0/0/0/3/0/0
Item1: None
Item2: None
Item3: None
Gender: 255
Hatch: 120
Friend: 0
EXP Rate: 5
EggGr1: 15
EggGr2: 15
Abil0: Pressure
Abil1: Pressure
AbilH: Telepathy
EscRt: 0
AltFrmIDs: 0
AltFrmSpri: 0
FrmCount: 1
Color: 8
BaseXP: 306
Height: 5.4 m
Weight: 683.0 kg
TM/HM: 01, 02, 05, 06, 08, 10, 11, 13, 14, 15, 17, 18, 20, 21, 24, 25, 26, 27, 31, 32, 35, 37, 38, 39, 40, 42, 44, 48, 49, 50, 59, 65, 68, 70, 71, 73, 77, 78, 80, 82, 87, 88, 90, 91, 92, 94, 100, HM01, HM04, HM06,
Special Tutors: Draco Meteor,
TutorSource1: 5,
TutorSource2: 2,4,5,6,14,15,16,
TutorSource3: 1,14,
TutorSource4: 9,12,13,
So...no, it appears that I was wrong, and Dialga's catchrate was lowered from 30 to 3.