Thunder Plains
The above map indicates the areas where lightning strikes most often. The number of bolts indicates the frequency of bolts: 1 = infrequent, 2 = somewhat frequent, 3 = very frequent. (This guide also indicates the item recieved in the US and Japanese versions of the game.)
5 consecutive bolts dodged: X-Potion x2 (US) (JP)
10 consecutive bolts dodged: Mega Potion x2 (US) (JP)
20 consecutive bolts dodged: MP Sphere x2 (US) (JP)
50 consecutive bolts dodged: Strength Sphere x3 (US), Attack Power Sphere x3 (JP)
100 consecutive bolts dodged: HP Sphere x3 (US) (JP)
150 consecutive bolts dodged: Mega Elixir x4 (US), Last Elixir x4 (JP)
200 consecutive bolts dodged: Venus Sigil (US), Fire Star Holy Seal (JP)
30 combined bolts dodged or struck by: Ether x1 (US) (JP)
80 combined bolts dodged or struck by: Elixir x1 (US) (JP)