Just to confirm, by commode, do you mean one with wheels and a hole in the seat for using the toilet as well? (sorry for being direct!) Or a shower chair?

Most hotels have a shower chair* so that should be fine. However, for a commode with toilet functionality, the hotels ones and rental companies generally don’t rent them for hygienic reasons.…

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Basically no, they don’t rent. I ordered a basic one from Amazon JP for 17,000 yen ($160 Canadian) and shipped to my wife’s sister place, but you can have it shipped to a Hotel, just need address. You’ll have to enter in the Japanese postal code (7 digits- 000-0000) or Amazon will default to what can be shipped to your country.