>>15969656The Japanese phonetic system's approximation of "platinum" is "pu-ra-chi-na", the "chi" being part of the ta/chi/tu/te/to consonant set.
The "Gi" that replaces the "Pu" of Platinum was written in Chinese as the character for "ride horseback"/"mount"/"cavalry". (The Chinese generally keep Japanese shared written forms and meanings with pokemon names but apply their own pronunciation when it differs) the "ra" is written as "pull, drag"/"seize, hold"/"lengthen." The implication of the "gi-ra" compound/sequence is a chariot or other horse drawn vehicle. The final characters for "Ti" and "Na" are "Supreme Ruler"/"Emperor" and "Admit/Take/Recieve/Accept" although it is the root form of the word "to store"/"to sheathe."
So other than the play on Platinum, it can also be literally written as Cavalry/Chariot (of the) Sheathed Emperor.