Hey guys, this quagsire has no weakness. literally no weakness. if you are expecting grass type of moves to OHKO this quagsire then you are probablly wrong. anyway, grass type moves increase quagsire's attact stat by 1 and it doesnt hurt it at all.
I have provided the best move set to tackle all most all types of pokemons as

1. 1. attack order is good for nailing grass, ghost, dark and psychic pokemons.
2. 2. earthquake and crabhammer gets STAB and they are pretty powerful.
3. 3. fusion bolt is perfect for OHKO water and flying pokemons
4. 4. BTW i threw in lucky egg as a bonus

as usual. press SELECT to activate the code and activated code replaces the pokemon at the 1st slot of the party.

ACTION REPLAY CODE

94000130 FFFB0000
B2000024 00000000
E0019728 00000088
B2D619AD DFCB0000
E485E6C0 99E0BDE6
D341E560 824C362D
41058566 25572C31
B2F00B60 FA8145A0
5CD3DB9D 45DD5A2E
D8269DAE 312715CB
9E30A2EB BDE71CE0
386B6B5F 9E90F95C
1ACC13A5 A72EAE6B
991B1846 A003517D
A3BBAE53 9D9ADE0D
ACBBC8E9 081BDF6D
2308A6E6 29CE88E5
D293467C E24ABE1B
ABE72B18 89CC9E0A
5E7EB369 A850088D
E00197B0 00000054
683B29CA B8BE0824
3F765741 032DA81F
931DD283 70082D39
4C038FFA C2718CFC
338DB33A B9A31C2A
8B7D118A DEE0CC29
4F0F3AC4 3EA6F87F
71502C7C 81248898
ACAC1364 15E969C7
B7C6BEF1 66DEA58A
F387AB3D 00000000
D2000000 00000000