I'm not sure whether anyone around has watched and followed Inazuma Eleven enough to be able to answer this... but here goes!
A brief description: Hissatsu techniques are special techniques in the anime which enables the users to do some powerful moves, including goal keeper techniques, defense, offense and shoots.
Now, I noticed that there are some hissatsu techniques which aren't used again, especially those used in the movies of the anime:
- Maximum fire used by Gouenji Shuuya in the movie Gekijyouban Inazuma Eleven Saikyou Gundan Ogre hasn't been used anywhere else in the anime.
- Omega the Hand used by Endou Mamoru in the same movie never appeared again. Ironically enough, the episodes immediately following it have Endou looking for a stronger hissatsu technique than his current strongest at that point in time (I hope this make sense ^^)
- Joker Rains used in the next movie, Kyuukyoku no Kizuna Gryphon by Shindou Takuto and Tsurugi Kyousuke is similar and isn't used again. Well, that one could be explained if they say they didn't want to use it again.
Is it just me or are the movies like... completely separate from the anime series? Why are hissatsu techniques exclusively used in movies never used again? If so, then there's something even stranger:
- Matsukaze Tenma met Shuu the first and only time in the second movie, but knows him when he sees him again in episode 8 of Inazuma Eleven Go: Chrono Stone.
- All those who went to God Eden in the movie also know about this place back in the series.
That's about the things I managed to notice, there might be more I didn't. The only thing I can think about is that the first movie alone is like a side/parallel storyline, or an alternative ending to the series, while the second movie is more like an actual event that happened but not much spoken of in the series, which I find really strange.