I had a bit too much time on my hands and found a nifty trick for quickly leveling your spells.
(hopefully, you've already played the game and are familiar with how these mechanics work)
Since the experience a skill / spell gains depends on the "rank" of the enemy you use it on, it's incredibly difficult to raise spells after level 10 or so. With standard enemies, (ranks 1 - 3) it would take hundreds of uses.
First, some prerequisites: Have Minwu in your party, or a character with a reasonably high-level "Blink" spell. (alternatively, the character whose spells you want to raise can have the high-level "Blink" spell themselves) Make sure the character has a decent amount of MP. (let's say 300+) Also make sure you've power-leveled enough that your HP is around ~2000. Finally, you will need the canoe so that you can traverse rivers.
- Travel to the Mysidian region. You can reach it by crossing the river (via canoe) directly west of Altair. Head south to find the Mysidian region. If you aren't sufficiently power-leveled, the enemies here will wipe you out.
- When you make your way just outside of Mysidia's village, kill off all characters except the one whose spells you want to raise, and the character with the high-level "Blink" spell. (unless your solo character already has a high-level "Blink" they can use on themselves)
- Get into an enounter with a group of "Black Flans." (or a mixed group, as long as there is one Black Flan) Black Flans have a rank of 5, which is sufficient for raising skill levels. At this point in the game, a rank-5 enemy is fairly hard to encounter.
- Repeatedly cast "Blink" on your character, until the Black Flan simply can't attack him / her.
- Start spamming the spell you want to raise, until you run out of MP. Finish off the Black Flan and end the battle once you have no MP remaining. Supportive spells and status spells that won't affect the Black Flan will have a better chance of prolonging the battle and allowing you to waste all your MP. Offensive spells are likely to make quick work of Black Flans. If you're not using offensive spells, it's a good idea to defeat all but a single Black Flan. (that reduces the time spent waiting on enemies to attack you)
By the end of the battle, it's very likely you've gained a full spell level. This technique is ideal for mastering the Toad spell so that you can get better rewards from the Snowmobile mini-game.
(hopefully, you've already played the game and are familiar with how these mechanics work)
Since the experience a skill / spell gains depends on the "rank" of the enemy you use it on, it's incredibly difficult to raise spells after level 10 or so. With standard enemies, (ranks 1 - 3) it would take hundreds of uses.
First, some prerequisites: Have Minwu in your party, or a character with a reasonably high-level "Blink" spell. (alternatively, the character whose spells you want to raise can have the high-level "Blink" spell themselves) Make sure the character has a decent amount of MP. (let's say 300+) Also make sure you've power-leveled enough that your HP is around ~2000. Finally, you will need the canoe so that you can traverse rivers.
- Travel to the Mysidian region. You can reach it by crossing the river (via canoe) directly west of Altair. Head south to find the Mysidian region. If you aren't sufficiently power-leveled, the enemies here will wipe you out.
- When you make your way just outside of Mysidia's village, kill off all characters except the one whose spells you want to raise, and the character with the high-level "Blink" spell. (unless your solo character already has a high-level "Blink" they can use on themselves)
- Get into an enounter with a group of "Black Flans." (or a mixed group, as long as there is one Black Flan) Black Flans have a rank of 5, which is sufficient for raising skill levels. At this point in the game, a rank-5 enemy is fairly hard to encounter.
- Repeatedly cast "Blink" on your character, until the Black Flan simply can't attack him / her.
- Start spamming the spell you want to raise, until you run out of MP. Finish off the Black Flan and end the battle once you have no MP remaining. Supportive spells and status spells that won't affect the Black Flan will have a better chance of prolonging the battle and allowing you to waste all your MP. Offensive spells are likely to make quick work of Black Flans. If you're not using offensive spells, it's a good idea to defeat all but a single Black Flan. (that reduces the time spent waiting on enemies to attack you)
By the end of the battle, it's very likely you've gained a full spell level. This technique is ideal for mastering the Toad spell so that you can get better rewards from the Snowmobile mini-game.
I cannot get anywhere after getting minwu because whenever I go past a certian point extremely powerful monsters attack and kill me in 3 turns or less 
