The 6 7 emote is not a standard permanent emote in Clash Royale
Check the in-game Shop for limited-time offers
Check the Pass Royale rewards track if it is part of a seasonal reward
Check special event rewards or challenge rewards
Check the Clan Wars or tournament reward pools if applicable
Watch for official Clash Royale announcements about limited emote releases
If it is unavailable in your game, it may not be obtainable right now