Don't hold your breath for a Zinnia and Wallace card (not in this set anyways) Winona is the only supporter in the set. Japan lists their trainers in order starting with items, then supporters, then stadiums, then special energy. Based off of what we know so far that means Winona is the only one this time around. Here is the known setlist so far:
01
02
03
04
05 Beautifly
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22 Thundurus EX
23 Natu
24 Natu
25 Xatu
26
27
28
29
30
31
32
33
34 Absol
35 Jirachi
36 Togepi
37 Togetic
38 Togekiss
39 Togekiss
40 Dratini
41 Dragonair
42 Dragonite
43 Dragonite
44 Altaria
45 Bagon
46 Shellgon
47 Salamence
48 Latios EX
49 Mega Latios EX
50 Hydreigon EX
51 Reshiram
52
53
54
55 Skarmory
56 Taillow
57 Swellow
58 Swellow
59 Swablu
60 Altaria
61 Rayquaza EX
62 Mega Rayquaza EX
63 Shaymin EX
64 Pidove
65 Tranquil
66 Unfezeant
67 Unfezeant
68
69
70 Trainer's Post
71 Mega Turbo
72
73 Gallade Spirit Link
74 Latios Spirt Link
75 Winona
76 Wally
77 Skyfield
78 Double Dragon Energy
79 FA Thundurus EX
80 FA Gallade EX
81 FA Mega Gallade EX
82 FA Latios EX
83 FA Mega Latios EX
84 FA Hydreigon EX
85 FA Rayquaza EX
86 FA Mega Rayquaza EX
87 FA Shaymin EX
88 FA Winona
89 FA Wally
90 Gold Energy Switch
91 Gold VS Seeker