The specific fan project that achieves this is often referred to as (created by various ROM hackers, most notably the team behind "Platinum Redux" or standalone sprite compilations).
Nintendo actively targets ROM distribution sites. While patch files exist in a gray area (as derivative works), downloading prepatched ROMs is copyright infringement. Moreover, many “free download” links are malicious—hosting malware or adware. Thus, the search term reflects both a creative desire and a legal risk. pokemon platinum gen 5 graphics link download
Platinum with gen 5 graphics VS original : r/PokemonROMhacks The specific fan project that achieves this is