can you help me identify this anime ?

hey everyone , i need help to identify this anime i watched some 20ish years ago.

I have tried using chat gpt but alas it keeps giving me the wrong answers

I dont have much to go on but one thing i do remember is that the protagonists had turned a firework factory into a giant mecha and were fighting giant monsters to defend their town


Thats literally all i remember.

Does this ring a bell for anyone ?

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