> せっかくならもっとすげえ **の** 用意してもらいてえもんだな

why is it there?
CC BY-SA 4.0
2022-11-19T20:52:30.480
97295
2022-11-19T23:00:56.900
2022-11-19T20:54:57.330
30454
55009
question
grammar
meaning of の after すごい
の turns an adjective into a noun, taking it from "amazing" (すごい) to "something
amazing" (すごいの).

If we take your sentence and simply write it in a more standard way, we get:
せっかくならもっとすごいのを用意してもらいたいものだ。

_せっかくなら  
_ _If you are going to go out of your way,_

_用意してもらいたいものだ。  
_ _(then come on...) I'd like you to prepare_

_もっとすごいのを  
_ _something even more amazing!_

See: [Particle の (Nominalizer)](https://www.tofugu.com/japanese-
grammar/particle-no-nominalizer/)
CC BY-SA 4.0
2022-11-19T23:00:56.900
97300
2022-11-19T23:00:56.900
18145
97295
answer