For anyone interested in Mystery Gifts:

Expiring Soon:
Gyarados - GYARAD0S2023SG - June 30th 2024

Pokemon Name - Code - Expiration Date
Cetitan - L1KEAFLUTE - August 31st 2024
Sprigatito - L1K0W1TH906 - September 30th 2024
Herb Mystica (Sweet 1:3, Spicy 2:3) - SWEET0RSP1CY - September 30th 2024
Revavroom - TEAMSTAR - October 31st 2024
Quaxly - D0T1STPARTNER - November 30th 2024
Dumb fucking hat - WEARTERASTALCAP - November 30th 2024
Chest Gimmighoul - SEEY0U1NPALDEA - November 30th 2024
Pawmot - Y0AS0B1B1R1B1R1- February 28th 2025
Expert Belt - SUPEREFFECT1VE - February 28th 2025
30 Quick Balls - G0TCHAP0KEM0N - February 28th 2025

No Expiration Date:
Rotom Phone Case - NE0R0T0MC0VER
Mythical Pecha Berry - Via Internet, requires DLC

Codes not released yet:
Talonflame: June 1st 2024 - June 2nd 2024
Porygon2: June 7th 2024 - June 10th 2024

As someone who started with Fuecoco the free Grass and Water starters are great.