Scripted encounter with FALSE double battle.
Trainers: Tabitha1, Maxie3.
Code:
; TABITHA_1
	.byte 0 ; party type flags
	.byte TRAINER_CLASS_NAME_MAGMA_ADMIN
	.byte TRAINER_ENCOUNTER_MUSIC_MAGMA ; gender flag and encounter music
	.byte TRAINER_PIC_MAGMA_ADMIN
	.charmapstr "TABITHA$", 12
	.2byte ITEM_NONE, ITEM_NONE, ITEM_NONE, ITEM_NONE ; items
	.4byte FALSE ; is double battle
	.4byte 0x1 ; AI flags
	.4byte 3 ; party size
	.4byte gTrainerParty_Tabitha1

; MAXIE_3
	.byte 0 ; party type flags
	.byte TRAINER_CLASS_NAME_MAGMA_LEADER
	.byte TRAINER_ENCOUNTER_MUSIC_MAGMA ; gender flag and encounter music
	.byte TRAINER_PIC_MAGMA_LEADER_MAXIE
	.charmapstr "MAXIE$", 12
	.2byte ITEM_NONE, ITEM_NONE, ITEM_NONE, ITEM_NONE ; items
	.4byte FALSE ; is double battle
	.4byte 0x7 ; AI flags
	.4byte 3 ; party size
	.4byte gTrainerParty_Maxie3

Tabitha's AI will actually be 0x7 due to Maxie's AI being smarter.
0x1 = random AI
0x7 = "smart" AI (Roxanne's or Rival2's)

Testing of turn1 (Scary Face will always be on Swampert):

Camerupt/Mightyena
1: Amnesia/Scary Face
2: Amnesia/Scary Face
3: Amnesia/Take Down on Swampert
4: Amnesia/Scary Face
5: Amnesia/Scary Face
6: Amnesia/Scary Face
7: Amnesia/Scary Face
8: Take Down on Swampert/Scary Face
9: Amnesia/Scary Face
10: Amnesia/Scary Face
11: Amnesia/Scary Face
12: Amnesia/Scary Face
13: Take Down on Swampert/Scary Face
14: Amnesia/Scary Face
15: Amnesia/Scary Face
16: Amnesia/Scary Face
17: Amnesia/Scary Face
18: Amnesia/Scary Face
19: Take Down on Metang/Swagger missed
20: Focus Energy/Scary Face
21: Amnesia/Swagger on Metang
22: Amnesia/Swagger on Metang
23: Amnesia/Swagger on Metang
24: Amnesia/Scary Face
25: Amnesia/Swagger on Metang
26: Amnesia/Scary Face
27: Take Down on Swampert/Swagger on Metang
28: Amnesia/Scary Face
29: Take Down on Swampert/Scary Face
30: Amnesia/Scary Face
31: Amnesia/Scary Face
32: Amnesia/Swagger missed
33: Amnesia/Scary Face
34: Amnesia/Scary Face
35: Amnesia/Scary Face
36: Focus Energ/Scary Face
37: Amnesia/Scary Face
38: Focus Energy/Swagger on Metang
39: Amnesia/Scary Face
40: Amnesia/Scary Face
41: Amnesia/Scary Face
42: Focus Energy/Taunt
43: Take Down on Metang/Scary Face
44: Amnesia/Swagger on Metang
45: Take Down on Swampert/Scary Face
46: Focus Energy/Scary Face
47: Amnesia/Scary Face
48: Amnesia/Swagger on Metang
49: Focus Energy/Scary Face
50: Amnesia/Scary Face
51: Amnesia/Swagger on Metang
52: Amnesia/Scary Face
53: Amnesia/Swagger on Metang
54: Amnesia/Scary Face
55: Amnesia/Take Down miss
56: Amnesia/Scary Face
57: Amnesia/Scary Face
58: Take Down on Metang/Scary Face
59: Amnesia/Scary Face
60: Amnesia/Scary Face
61: Amnesia/Taunt on Swampert
62: Amnesia/Swagger on Metang
63: Take Down miss/Scary Face
64: Amnesia/Scary Face
65: Focus Energy/Scary Face
66: Focus Energy/Swagger on Metang
67: Amnesia/Scary Face
68: Amnesia/Scary Face
69: Amnesia/Swagger on Metang
70: Focus Energy/Scary Face
71: Focus Energy/Scary Face
72: Amnesia/Taunt on Metang
73: Amnesia/Scary Face
74: Amnesia/Take Down on Metang
75: Take Down on Metang/Scary Face
76: Amnesia/Scary Face
77: Amnesia/Scary Face
78: Amnesia/Scary Face
79: Amnesia/Scary Face
80: Amnesia/Scary Face
81: Amnesia/Scary Face
82: Camerupt got crit lol/Scary Face
83: Take Down on Swampert/Scary Face
84: Amnesia/Scary Face
85: Amnesia/Take Down miss
86: Amnesia/Swagger on Metang
87: Amnesia/Scary Face
88: Amnesia/Swagger on Metang
89: Amnesia/Swagger on Metang
90: Focus Energy/Scary Face
91: Amnesia/Scary Face
92: Amnesia/Scary Face
93: Amnesia/Swagger on Metang
94: Amnesia/Scary Face
95: Amnesia/Scary Face
96: Amnesia/Scary Face
97: Amnesia/Scary Face
98: Take Down on Swampert/Scary Face
99: Amnesia/Scary Face
100: Amnesia/Scary Face