Inflation is a natural phenomenon that will occur with or without any amount of central monetary planning. It's impossible to introduce new currency without it affecting the value of that currency. You either don't introduce currency, which causes the existing currency to become more and more valuable as economic developments create new value, or you print some new money which will cause some amount of inflation.
If your economy has $1000 dollars in it, and suddenly a new invention allows you to create 50% more widgets for the same cost, then the same amount of money is now more valuable since it can fund the creation of more stuff. You can instead add another $500 to the economy to represent this new wealth, but that will have an inflationary effect. You can try to balance it to keep it relatively low, which is what the Fed does with its 2% inflation target, but there's no real way to completely get rid of it. Additionally, some amount of inflation encourages people to put money into more productive assets like investments rather than simply hording all their money, allowing the existence of things like credit, which are pretty helpful for anyone looking to start a business or buy a house. But, credit requires you to either have a lot of money sitting around in order to make that loan, or you need to be able to print money. The latter offers a lot more flexibility, but again, thus inflation.