Help To understand these sentences

[Wellington]

I didn't understand certain parts in these sentences.

1) かわいかったから仲よくしたかっただけだもん。
What is the meaning of し in this sentence?
What is the meaning of もん in the end?

This second sentence is from Pokemon (anime), I didn't understand ピカッとキャーッチ. I guess ピカ is related to the Pikachu, but I didn't understand ッとキャーッチ.
2) ユリーカ ピカッとキャーッチ！

 

[Mike Cash]

How can you need the し explained but be okay on the following たかった?

仲良く する
仲良く したい
仲良く したかった

 

[Wellington]

How can you need the し explained but be okay on the following たかった?

仲良く する
仲良く したい
仲良く したかった

Now I understood. Your comment reminded me.

たかった = たい conjugated in the past. I studied たい before, but I didn't remember that たい is after the stem of a verb and し = stem (する).

 

[Mike Cash]

What did you think it was before I reminded you? You didn't ask about it.

 

[Wellington]

What did you think it was before I reminded you? You didn't ask about it.

I didn't have any idea what it was.These sentences I extract from an anime, even if I don't remember し. I still can understand the general meaning of the sentence, the context helps me, the anime.

 

[Mike Cash]

What's the meaning of the full sentence?

 

[Wellington]

What's the meaning of the full sentence?

The translation is free, I mean, each person will translate different, but this is the general meaning I understood.

かわいかったから仲よくしたかっただけだもん。
"I just wanted to become friend because it was cute."

 

[Mike Cash]

Very good!

 

[lanthas]

To answer your question about もん:
What does ～もん mean as a sentence final particle? • r/LearnJapanese

For キャーッチ, I can only guess it's an elongated form of キャッチ.

 

[Wellington]

To answer your question about もん:
What does ～もん mean as a sentence final particle? • r/LearnJapanese

For キャーッチ, I can only guess it's an elongated form of キャッチ.

And ッと before キャーッチ. Do you know the meaning? I didn't find in the dictionary.

 

[lanthas]

It turns out ピカッと is in fact a standard adverb, not a made-up one based on Pikachu.

This ッと is commonly seen with adverbs. Other examples include チラッと, パッと, ギョッと, ドキッと etc.

 

[Wellington]

I thank all.

 

[Toritoribe]

Actually, Pikachu is named from this onomatopoeia.

 

[Wellington]

Actually, Pikachu is named from this onomatopoeia.

I thought about it the first time I've seen because I know Pikachu's sound is ピカ.