On July 2, 2018, Pomares signed with the San Francisco Giants as an international free agent for $975,500.[1][3]
Pomares made his professional debut in 2019 with the Rookie-level Arizona League Giants and was promoted to the Salem-Keizer Volcanoes of the Low-A Northwest League during the season.[4][5] Over 51 games between both affiliates, Pomares slashed .324/.362/.465 with three home runs and 37 RBI in 213 at-bats, playing primarily in right field.[6] He did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[7]
Pomares missed the first six weeks of the 2021 season while recovering from back surgery, but eventually began play with the San Jose Giants of the Low-A West in June, playing primarily in right field.[8] His .694 slugging percentage led the Low-A West.[9] He was promoted to the Eugene Emeralds of the High-A West in August, playing in left field.[10] Over 77 games with the two affiliates, Pomares compiled a slash line of .334/.378/.629 with 20 home runs, 59 RBI, and 27 doubles across 302 at-bats.[11]
Pomares returned to Eugene for the 2022 season,[12] ultimately playing in 95 games and hitting .254/.330/.438 with 14 home runs and 59 RBI, while playing primarily left field.[13] Playing for the rookie-level Arizona Complex League Giants, he was 8-for-15, with three doubles and three home runs.[14] Pomares missed almost the entire 2023 season due to injury, making nine rehab appearances for the ACL Giants.[15]
Pomares made 82 appearances for the Double-A Richmond Flying Squirrels during the 2024 season, batting .238/.280/.434 with 12 home runs, 47 RBI, and nine stolen bases.[16] He returned to Richmond in 2025, hitting .209/.268/.352 with nine home runs, 34 RBI, and nine stolen bases over 76 games. Pomares was released by the Giants organization on July 14, 2025.[17]
On March 19, 2026, Pomares signed with the Lincoln Saltdogs of the American Association of Professional Baseball.[18]