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human
[Percy Jackson and the Olympians] Why did Luke stop using his teleportation and scorpion-summoning powers after the first book?

They would’ve come in handy a lot.
gpt
We really don’t see Luke in combat situations very often. Obviously it only happens once in The Lightning Thief, and he uses the powers. But in Sea of Monsters he only appears in combat one time again, and he had his entire army with him at that point and Percy challenged him to a straight up one on one duel, so there wasn’t really a need to use his powers again. 

In Titan’s Curse, Luke was already considerably weaker than he was in the previous two years because of Kronos’ rising power over him and because he had been holding up the sky for Atlas for a while. The one time we see him fighting in that book he could barely even stand up, and he promptly gets his ass kicked and dropped off a cliff by Thalia, so there wasn’t an opportunity for him to use his powers really. 

Then in Battle of the Labyrinth, we never see Luke in a combat scenario until his body was taken over by Kronos at the end of the book, and those kinds of powers are pretty far beneath Kronos’ who can literally control time without trying. He keeps those powers until like a minute before he dies, so no real need for those powers to come up again when Kronos was controlling him.