The song most likely being referred to is not one official track named “Lemonade Serenade.” From the public posts I found, creators discussing the Roblox Fisch item mention different background songs in their videos, including “Athletic Theme - Yoshi’s Island,” “dizzy - Joakim Karud,” and “Better Days - LAKEY INSPIRED.”

What this means

  • The phrase “Lemonade Serenade” appears to be the Fisch item/quest name, not necessarily a song title.
  • Different clips about it use different music, so there does not seem to be one single universally attached song from the public results I found.

Best match

If you mean the song in the most detailed guide video about getting Lemonade Serenade, the credited music includes:

  • Athletic Theme - Yoshi’s Island.
  • dizzy - Joakim Karud.
  • Better Days - LAKEY INSPIRED.

Practical answer

For a single answer, the safest pick from the available evidence is “Better Days” by LAKEY INSPIRED , since it is explicitly listed among the music credits in the guide video about Lemonade Serenade.

TL;DR: There doesn’t appear to be one official “Lemonade Serenade” song; the clearest credited track tied to a guide video is Better Days - LAKEY INSPIRED.