Yes, you can get visas with a dummy ticket. The embassies of most countries ask for flight reservations to apply for a visa. like Canada,
the United States, Cuba, Peru, Chile, Argentina, the United Kingdom, Schengen countries, Turkey, South Africa, the United Arab Emirates,
Russia, Sri Lanka, Thailand, Vietnam, Malaysia, Singapore, Australia, New Zealand, China, South Korea, Japan, and others. Check the Required Documents
checklist to ensure that if the flight reservation is mentioned in the checklist, you can apply for your visa with a dummy ticket.