Pokémon Journeys - Summer Special Arc will feature Dawn and Piplup

After 9 years, Dawn and Piplup will return in the anime in a special two-part arc featuring: "Darkrai - A Midsummer Night's Dream" (July 23, 2021) and "Cresselia - A Midsummer Night's Light" (July 30, 2021).

Anime “Pokémon” The re-appearance of Dawn and Piplup! The two-week consecutive broadcast of the “Winter Special Episode”, PV has been released

The new Pokemon anime seems to be different than others. Do you expect some familiar characters to appear? - Quora

New Pokémon Master Journeys Trailer Sees Ash Reunited With Dawn and Cynthia

Pokémon: The Series — Dawn / Characters - TV Tropes

Dawn's Piplup, Pokémon Wiki

In my opinion, Serena had the best return episode not only in Journeys but in the entire series. No other return has been met with as much hype leading up to JN105.

DP091 - Bulbapedia, the community-driven Pokémon encyclopedia

JN074 - Bulbapedia, the community-driven Pokémon encyclopedia

What's a Pokemon Anime opinon that will have you like this? I'll go first Chole is actually NOT a bad character! : r/pokemonanime

Dawn and Piplup are back!! Pokemon Master Journeys!!

Pokemon Anime Updates Fans on What Dawn Has Been Doing Since Traveling With Ash

DAWN RETURNS CONFIRMED, ASH'S COMPANIONS RETURN, SPECIAL Sinnoh Episodes + MORE! - Pokémon Journeys

Pokemon: Best Dawn Episodes